Season four is an adaptation of the fifth part of the JoJo's Bizarre Adventure series, Vento Aureo. It was officially announced by Hirohiko Araki on June 21, 2018 at the end of a live news conference for his Ripples of Adventure art exhibition.
A Japan premiere of the anime was held at the Tokyo Istituto Italiano di Cultura on July 5, 2018, with appearances by the anime's main cast. At the same time, a French premiere was held during the same day at Japan Expo. An American premiere was held the next day at Anime Expo in Los Angeles on July 6, 2018.
As part of the LUMINE x JOJO collaboration, a second screening for the first two episodes was held at the Lumine Zero Shopping center in Japan on September 25, 2018. The anime began broadcast on Japanese television and streaming services starting on October 5, 2018.
On October 4, 2019, it was confirmed by VIZ Media that the English dub had been scheduled to air on the Adult Swim Channel. The season began broadcasting on Toonami on Sunday, October 27, 2019.
In 2001: 2 years after the events of Diamond is Unbreakable, Koichi Hirose travels to Italy by Jotaro's favor. He departs Naples Airport to find a boy by the name of Haruno Shiobana. Koichi comes across a peculiar young man who tricks him and drives off with his luggage. Koichi overhears two airport security guards reveal the young man's name as Giorno Giovanna, and infers that Giorno might be Haruno Shiobana. Meanwhile, Giorno meets with the gangster Leaky-Eye Luca, who attacks Giorno and is put into a coma after his attack is reflected back. Giorno reveals his Stand, Gold Experience, and creates a tree to escape from Koichi who caught up to him. Koichi calls Jotaro by telephone, revealing Giorno is the son of DIO. Escaping by train, Giorno encounters Bruno Bucciarati who questions him about Luca's death. Giorno lies to him and Bucciarati goes away. After, Giorno opens his hand only to find an eye enclosed, and Bucciarati reappears behind him and confirms he's lying by licking his face.
In a flashback, it is revealed that Giorno, who was once abused by his step-father and bullied by other kids, started being treated with respect after saving an injured gangster, giving him a reason to live. Back in the present, Giorno uses Gold Experience against Bucciarati, which causes his senses to go berserk upon being hit. Bucciarati brings out his own Stand, Sticky Fingers, allowing him to create a dimension distorting zipper to try and escape inside another person, but Giorno tracks him down by turning one of Bucciarati's teeth into a fly. Despite beating Bucciarati in a duel, Giorno decides against finishing him off, instead asking to join his organization so he can take down his boss and take over the city.
Telling Bucciarati about his ambition, Giorno convinces Bucciarati to let him join the organization Passione and Bucciarati leads him to a lieutenant of the gang Polpo, who is currently sitting in prison. After entering the prison, Giorno asks to join the gang and is assigned a test in order to see if he is trustworthy- which is to guard a lighter's flame for 24 hours. Giorno accepts and leaves the prison, and after a series of close calls, manages to get into his dorm, only for Koichi to intrude in order to find his stolen passport. Giorno again narrowly escapes with the lighter however the lighter is extinguished accidentally by a janitor cleaning the area. Distraught, Giorno believes he has blown his chance, and is surprised when the janitor reignites the lighter. However, Black Sabbath appears and it impales the janitor's soul with an Arrow, killing him. Realizing that he has activated Polpo's Stand, Giorno braces himself as Black Sabbath lunges at him.
Black Sabbath tries to attack Giorno, revealing itself to be more powerful than Gold Experience as well as being faster. Luckily, a ray from the sun manages to stun the Stand, allowing Giorno to escape its grip, and the young boy understands that Black Sabbath is weakened by sunlight but powerful in the shades. When Koichi comes, the two teens ally to lure Black Sabbath into the light and annihilate it. Afterward, Giorno convinces Koichi of his righteousness and also makes him keep his secret goal. Koichi thus reassures Jotaro about Giorno and departs from the latter's life. The next day, Giorno is welcomed by Polpo into the gang and officially assigned to Bucciarati. But as revenge for the janitor, he secretly turns one of the lieutenant's guns into a banana. Long after Giorno steps out of prison, Polpo finally eats the banana and kills himself with a shot to the head. Meanwhile, Giorno is on his way to meet Bucciarati's Gang.
While Bucciarati explains how Passione functions as a gang, the news of Polpo's death spreads throughout the mob. Two gangsters, Sale and Mario Zucchero, take an interest in Polpo's hidden treasure that Bucciarati supposedly knows of. Giorno formally meets his new teammates, and manages to make a good impression despite them antagonizing Giorno. Learning about Polpo's death, Bucciarati immediately tells the gang to set sails. On their way to Capri in order to retrieve the treasure, an unseen enemy Stand ambushes them, making Narancia, Mista and Fugo disappear without trace. As Abbacchio is reluctant to show his Stand to the newbie, Giorno makes the gamble that their opponent's way of attacking isn't fatal, and purposefully exposes himself. He is stabbed by the Stand and disappears. Thus Abbacchio is free to summon his Moody Blues.
Leone Abbacchio's past is revealed. Once a policeman corrupted by his surrounding, his moral downfall culminated in the murder of his partner in the police by the same criminal who had been bribing him. Dishonored, Abbacchio became desperate until he met Bucciarati. In the present, Bucciarati and Abbacchio begin to investigate the enemy's power, using Moody Blues' power to reenact any event from the past to discover how the enemy works. Although they discover that the enemy can deflate people and is probably hiding in the pipes, they cannot find him. However, Abbacchio sacrifices himself and uses blood to make Bucciarati understand that there is a second deflated boat covering the first one. Bucciarati thus sinks his yacht on purpose, forcing Zucchero to reveal himself and easily defeats him.
After Mario Zucchero is defeated, Bucciarati's team learns that he's told his yet unseen partner that they were headed to Capri to retrieve the treasure. As Bucciarati took a long curve to avoid being seen directly heading toward Capri, the group expects to fight another enemy on the island, but Giorno proposes to head there first and seek out their foe. Near the marina, Giorno calls for the enemy through a civilian while Mista lies in wait, ready to fight. The enemy Sale falls for the bait, and despite some mishaps, Mista manages to shoot Sale in the leg thanks to his Sex Pistols's power to redirect bullets. Mista pursues the enemy alone up to a starting truck, leaving Giorno behind.
Guido Mista's past is revealed: Mista was once a simple teenager enjoying life until he met his destiny and stopped a gang rape, revealing his outstanding gunfighting skill. In the present, Mista shoots Sale who was hidden atop the truck. Yet, Sale's Stand Kraft Work can immobilize objects with respects to a given reference point. Thus Mista is at a tremendous disadvantage as bullets cannot penetrate Sale's skin while he can even fire the bullets back at Mista. After a back and forth, Mista is left with one bullet, and wastes it. However, he only tricked Sale into dropping his guard, and has Sex Pistols hijack Sale's own bullet, which hits Sale right in the first bullet still locked inside Sale's skull. The bullet is pushed inside the brain and Sale is defeated, but alive.
Having succeeded in coming to Capri safely, Team Bucciarati meets with the capo Pericolo. Polpo's treasure which was hidden inside a restroom's walls is examined and deemed great enough, thus Bucciarati is officially made into a capo of the gang. However, Pericolo then presents Trish Una, the daughter of the Boss. Born from a long past tryst, Trish is now the target of a rogue team of Stand User assassins who hope to get their hands on her to get to the Boss, and Bucciarati's team must now bodyguard her. Later, Narancia is sent out of the hideout to buy groceries but is easily found by Formaggio, one of said assassins. Formaggio's Little Feet claws at Narancia who unleashes his Aerosmith to fire at the car. Formaggio then uses his power to shrink himself and others to hide and wait for Narancia to shrink, discovering at the same time that Bucciarati's team is bodyguarding the Boss' daughter.
The fight between Narancia and Formaggio continues. Having shrunken himself and hiding inside Narancia's pocket, Formaggio patiently waits for his foe to shrink. However, Narancia understands what's happening to him and, to stop Narancia from calling for help, Formaggio must cut the wire of the phone Narancia uses. The boy realizes that Formaggio is nearby and uses an unknown ability to track Formaggio. Running away, Formaggio is relentlessly tracked into a drain. A flashback then explains how the Hitman Team, dissatisfied with their pay, had two of their members gruesomely executed for daring to pry into The Boss' past. In the present, Formaggio now understands that Aerosmith is tracking him because of the CO2 he releases. Using a swarm of rats, Formaggio tries to hide but Narancia manages to identify him and shoot. Although he is hit, Formaggio grows back to his original size while Narancia and Aerosmith have become so tiny that they are too weak at the moment.
Narancia has now shrunk to the point where he cannot do significant damage to Formaggio. Failing to hide, the assassin stomps him under his foot and resumes his interrogation, but Narancia keeps silent. Narancia's sad story is also revealed: once a street urchin and loyal to his little band of thieves, Narancia was one day framed for a violent aggression by his comrade and was thrown into reform school for a year, only to be shunned when he got out. Ill and alone, Narancia escaped his squalor thanks to Fugo and Bucciarati, to whom he is now loyal to. In the now, an exasperated Formaggio throws Narancia inside a bottle with a spider in it and manages to learn where Trish is kept. However, Narancia reverses the situation by making his own car explode thanks to Aerosmith's tracer bullets, grows back to normal size, and then devastates the entire street to prevent the assassin from fleeing. Finishing Formaggio off, Narancia returns to the hideout where Bucciarati receives The Boss's second orders. He then sends Fugo, Abbacchio and Giorno to Pompeii to retrieve a key.
Giorno, Fugo and Abbacchio arrive to the famous ruins of Pompeii. As the trio is walking toward the dog mosaic, Fugo sees a mirror and a new enemy in the reflection. It is Illuso, one of the assassins from La Squadra Esecuzioni. As Illuso approaches, Fugo warns his teammates who cannot see the enemy and Fugo is suddenly snatched into the mirror world, confronting Illuso and his Stand, Man in the Mirror. Fugo then tries to summon his Stand Purple Haze but the Stand is kept out of the mirror, interrupting Giorno and Abbacchio's search for Fugo. A flashback exposes Fugo's past. As a well-born child with high intellect, Fugo was so pressured into academic excellence that it took a toll on his sanity. Entering a university at age 13, he finally snapped and beat up a professor to defend himself but was expelled then disowned, eventually meeting Bucciarati and being swayed to his side. Fugo tries his best to fight Man in the Mirror indirectly but Illuso easily bests him while Purple Haze's actions cause one of the capsules on his fist to crack, revealing its ability to release a deadly flesh-eating virus. Abbacchio decides to prioritize the objective but Giorno insists on helping Fugo, and Abbacchio leaves Fugo to his fate. Meanwhile, Illuso approaches Fugo for a coup de grâce.
The battle against Illuso and Man in the Mirror continues. Abbacchio reaches the key but Illuso has detected and followed him, neglecting to kill Fugo. Abbacchio sees Illuso inside of a mirror as well and understands the situation. Tricking Illuso into forcing a disguised Moody Blues to enter the mirror world and gaining the upper hand, Illuso nonetheless uses a piece of glass to trap both Stand and User half inside of the mirror, disabling both. Desperate, Abbacchio cuts off his hand to permit Moody Blues on the other side to bring back the key to Giorno's position and Illuso attacks Giorno. However, Giorno has infected himself with Purple Haze's virus, exposing Illuso who must flee to the real world. Nonetheless, Giorno has also turned a brick into a snake, allowing Fugo to guess Illuso's position thanks to the snake's heat sense. Purple Haze then dissolves Illuso. For his part, Giorno manages to save himself by using the snake's blood as an antivenom, greatly impressing his teammates. The team has acquired the key.
Discovering new instructions from the Boss engraved on the key, the group now heads to Naples' train station. Near the Florence-bound Express, Bucciarati discovers a turtle whose shell fits with the key, grabs it and rushes inside the train to his team, evading two new enemies that have been following him: Prosciutto and his junior Pesci. Perplexed by Bucciarati's sudden disappearance, the pair decides to stay on the train. Unbeknownst to the assassins, the small turtle acts as a stealthy shelter for Team Bucciarati thanks to its Stand ability and hides in a corner of the driver's cabin. To draw them out, Prosciutto summons his Stand The Grateful Dead and accelerates the aging of the train's passengers, sweeping the wagons while Pesci stands guard near the driver's cabin. Affected by the aging, the group discovers that ice can slow it down then sends out the relatively unaffected Mista out to fight the enemy. However, when Mista tries to activate the air conditioner, he is ambushed and is hooked by Pesci's fishing rod Stand, Beach Boy.
The battle between Mista and Pesci begins. Having hooked Mista by the hand and Beach Boy's line being unbreakable as well as able to reflect energy into the catch, Pesci seems to have the advantage and tries to reel Mista in, making the hook draw closer to the gunman's heart. Nonetheless, Mista turns the table on his foe by firing Sex Pistols and destroying his ice, making Pesci panic and unsummon Beach Boy. Mista confronts Pesci and almost shoots him but Prosciutto, disguised as an old man, takes Mista's hand and disables him. Lecturing Pesci again on his team's fighting spirit, Prosciutto shoots Mista in the head and goes back to the cabin. Prosciutto and Pesci eventually find the turtle but are attacked by Bucciarati, as Mista has survived thanks to Sex Pistols and informed his leader of the situation. However, Bucciarati's fight exhausts him and the aging effect takes hold, forcing the capo to throw himself out of the express train with Prosciutto and hopefully take him out.
The battle against Prosciutto and Pesci continues. Bucciarati has thrown himself out of the train with Prosciutto in his arms in the hopes of killing the assassin. Pesci intervenes to grab Prosciutto but Bucciarati returns Beach Boy's reflecting power against his enemy, zipping out Prosciutto's hand. Prosciutto seemingly falls to his death while Bucciarati is hooked. Pesci realizes the situation and despairs, but when he sees that Prosciutto has put himself inside the machinery of the train and maintained The Grateful Dead despite his wound, he is inspired by the example and changes into a cold-blooded killer. Pesci tries to kill Bucciarati who is forced to enter the train again and separate himself into many pieces to evade Beach Boy. However, he's cut his heartbeat and respiration to do so. Bucciarati almost dies but Pesci finally loses patience and drop his guard to stop the train. The two confront each other one last time and Bucciarati wins, pummeling Pesci into a river. The two assassins are dead. However, it seems that Trish is manifesting for the first time her Stand power and Melone the assassin is on the team's trail.
In the express train, Melone uses Bucciarati's blood sample and a woman he's deemed really incompatible with the former to create a Stand homonculus thanks to his Baby Face, teaching him how to kill Bucciarati and capture Trish before siccing him on the team. Meanwhile, Team Bucciarati is forced to stay on a parking lot and tries to steal a car. Giorno, carrying Coco Jumbo containing Trish and Bucciarati is temporarily isolated from the team. It is at this moment that Baby Face sneaks inside the turtle and turns both Trish and Bucciarati into cubes, then takes away Giorno's throat, a foot and an eye. Crippled and suffocating, Giorno is at first utterly overwhelmed by Baby Face but then realizes from witnessing its cube power that he can shape objects into individual organs and heal. Managing to retake the turtle, Giorno outsmarts Baby Face and fakes having his hand cut off, turning the decoy hand into a piranha devouring its way out of Baby Face.
Now having the advantage against Baby Face, Giorno then makes short work of the homonculus despite its physical growth. With his victory, Bucciarati and Trish also return to normal. The assassin Ghiaccio arrives to the parking lot some time after, only seeing a bunch of stolen cars. Although Melone assures on the phone that he can track the group again, he is suddenly killed by a venomous snake sent by Giorno. The assassins have seemingly lost trace of their target but Risotto Nero their leader has managed to find another trail. Meanwhile, the group discovers by rewindind Moody Blues that Pericolo has set up further instructions for them: they must retrieve a disc hidden near Venice's train station to read how to deliver Trish. Moreover, Pericolo has shot himself, and The Boss is now awaiting Trish's arrival. Giorno and Mista are sent together retrieve the disc, but the duo is then confronted by Ghiaccio, who thanks to computer analysis on Pericolo's computer has managed to discover their destination. Ghiaccio's Stand White Album is a deadly Stand of cryogenic power which can kill through simple exposure and makes an invincible ice suit around Ghiaccio. Unable to shake him off, Giorno decides to drive his car into the sea.
The battle against Ghiaccio continues. Having driven into the sea, Giorno hopes to slow down White Album's freezing ability with salt water and tells Mista to get away while he stalls Ghiaccio. When Ghiaccio freezes the sea to demonstrate his power, Mista ang Giorno cooperate to create a grass sled from frozen car parts, allowing Mista to approach the shore. Then, turning the grass back into car parts, they manage to drive a screw into Ghiaccio's helmet and stun him. Surprisingly, Mista decides to fight Ghiaccio, discovers a airhole on White Album's neck area and shoots into it, but Ghiaccio activates his technique "White Album Gently Weeps" to create a barrier of frozen air, rebounding the bullet back at Mista. Now on solid ground, Mista confronts Ghiaccio again. Giorno sprays his blood in the air, exposing the weaknesses in the frozen air. Mista is also reminded of how Bucciarati helped him out of prison and enlisted him in the gang. Ghiaccio then simply shuts his airhole, using the frozen air as oxygen reserve. Nonetheless, Mista manages to impale Ghiaccio on a broken lamppost and tries to shoot him further. A bloody shootout ensues but Ghiaccio freezes his own blood into pillars, taking the advantage. At last, Giorno intervenes to save Mista and deals the finishing blow to Ghiaccio. Mista and Giorno have won the battle and awakened a great respect for one another.
Team Bucciarati have acquired the Boss' last orders: they must now head to the San Giorgio Maggiore church South of Venice, and one of them must accompany Trish to the top of the belfry, withoug weapons or communication tools while the rest waits inside the boat. It is a unique opportunity to appraoch the Boss so Giorno gives a brooch to Bucciarati to act as a tracker. On their way to the belfry, Trish finally shows nervousness at the idea of meeting her estranged father but Bucciarati does his best to reassure her. Suddenly, Trish disappears, with only her hand remaining in Bucciarati's palm. He thus realizes with horror that the Boss wanted to kill Trish personally. Bucciarati's past is revelead: once the ordinary son of a fisherman, Bucciarati's life took a turn for the worse when his father was gunned down by drug dealers when he saw an illegal trade happening. Bucciarati then had to kill them to protect his father and consequently had to join Passione for protection. Soon he discovered that Passione itself was the origin of the drugs. Utterly disgusted, Bucciarati decides to kill the Boss and gives chase. But, when Bucciarati hides in a columbarium to ambush the Boss, the latter somehow knows where he is. Bucciarati tries to attack, but his every move are foiled. As he sees a reflection of himself, the Boss reveals his King Crimson and explains his power to erase time, and punches straight through Bucciarati's torso.
Back to the boat, Giorno and his teammates wait for Bucciarati's return. But when events seem to have happened without anyone remembering performing them, Giorno rushes to the church to help Bucciarati. Meanwhile, the capo gets punched through the stomach by King Crimson but amazingly continues to fight. King Crimson erases time again, effortlessly avoiding Sticky Fingers' punch and lands a karate chop that splits Bucciarati's torso in two. However, the Boss is then sucked into the brooch Giorno has given life to. Bucciarati wins enough time to grasp the gist of King Crimson's power and tries to get rid of the turtle, but when he tries to crawl up the stairs with Trish, King Crimson blocks his path, having forecasted the attack and avoided it too. Fortunately, Bucciarati tricks King Crimson into letting him create a zipper to the ceiling and he escapes, meeting Giorno. Confusion ensues as Giorno realizes Bucciarati is physically dead, but he continues moving as if he was alive. With too many witnesses, the Boss decides to retreat. Out of the church, Bucciarati explains what has happened and gives his team the chance to join him in his fight agains the Boss. The team is frightened, but all save Fugo manage to gather the resolve to follow their leader. Meanwhile, the operative Squalo receives the order to hunt the rebels.
Still in Venice, Team Bucciarati goes to a restaurant to rest and decide their next course of action. Sure that they can learn about the Boss's identity to ambush him and bypass his King Crimson, the team learns from Trish that the Boss had met her mother in Sardinia and thus the island is where they can learn about him. Narancia is suddenly attacked by a shark Stand named Clash, which rips off his tongue. Unfortunately, Clash can teleport between liquids and remains unseen by all but Narancia. Moreover, when Giorno saves him from suffocating and gives him a new tongue, Narancia begins to only tell lies, giving his teammates falsehoods. Indeed, a duo of Passione operatives, Tiziano and Squalo, are ambushing the group, using Tiziano's Talking Head to force Narancia to lie and bait them into watery places where Clash can ambush them. Narancia narrowly prevents his team from staying in the bathrooms too long, and they all leave but Giorno. Talking Head cuts Narancia's hand but when Giorno approaches, Narancia uses Aerosmith to shoot on a pipe and heat it with incendiary ammo and cauterize himself. Giorno understands that Narancia is under the effect of some power, but the damaged pipe leaks water, creating a puddle from which Clash emerges to tear at Giorno's throat.
Tiziano and Squalo's ambush on the heroes continue. Clash has managed to bite into Giorno's throat and has disabled him, dragging him along in the puddles while evading Aerosmith's bullets. Nonetheless, the duo are aware that Narancia can detect CO2 and thus track Giorno. Although Squalo baits Narancia into opening the way to the sewers, Giorno willingly lets himself get shot so that the tracer bullets can emit CO2 for him. Thus Narancia is able to chase Clash until it is cornered in the kitchen room. Despite the leaking gas preventing him from shooting Narancia slashes at Clash with Aerosmith's propellers. Tiziano intervenes and uses Talking Head to bait the team into the kitchen room and trick Mista into setting the gas on fire by firing his gun. An explosion ensues and Giorno uses the opportunity to tell him to find the User and gives him a brooch before Clash can take him. Narancia listens and gives chase to Tiziano and Squalo until he successfully finds them. Despite Tiziano's sacrifice, Narancia finally kills both of the enemies and finds Giorno barely alive. Team Bucciarati subsequently crosses the sea to an airport in order to fly to Sardinia.
Having managed to escape Venice, Team Bucciarati now heads to the Venezia-Tessera Airport and steals a passenger plane to fly to Sardinia. During the preparations, a Passione operative named Carne confronts them but Mista seemingly makes short work of him, only leaving him the time to briefly summon his Stand. Giorno touches him and confirms his death. Once the plane is up in the air, Trish and Bucciarati discuss their situation and Trish mentions Cala di Volpe, a small Sardinian bay in which her mother met the Boss, who was a local. Meanwhile, Giorno and Mista discover some of Carne's fingers, which got into the fridge of the plane without explanation. Giorno then discovers that his right arm is being absorbed by an enemy Stand. Notorious B.I.G, Carne's Stand, activates after death, can devour all energy and matter to grow, and is automatically attracted to the fastest object in the vicinity. Before Giorno can make it get out of the plane, he loses both arms and Mista and Narancia are heavily injured. The situation is extremely dire as half of the team is gravely injured with no healers available. Yet, as Bucciarati goes to the cockpit with the injured in the turtle to inform Abbacchio of what happened, Trish is left alone with Notorious B.I.G, which has managed to catch up to the plane. Trapped, Trish then sees that Giorno has left a brooch from which a brand new hand is growing.
Trish is trapped with Notorious B.I.G but must find a way to protect Giorno's growing hand and herself at the same time. Using the automatic reclining seats, Trish manages to go past the enemy Stand and approach the hand. However, Notorious B.I.G suddenly attacks her because of the droplets of drink slipping on her boot. Trish is nonetheless saved by her newly awakened Stand, Spice Girl, which can soften things. Using the softening, Spice Girl manages to bait Notorious B.I.G into attacking a clock without damaging it and seemingly destroys it. However, a tiny part of Notorious B.I.G reaches the engines, feeds on the energy in them and grows into a big size. Trish again saves the situation by softening the cockpit and then separate it from the crashing plane, acting as a makeshift parachute. Finally, the group manages to reach Sardinia and Giorno has regained his power. For his part, Notorious B.I.G will become in time a sea monster roaming the waters near Sardinia. Meanwhile, the Boss discovers the existence of a clue to his past in Sardinia. Sensing that Trish is alive, he decides to personally go to his native island.
Back in 1965, a baby boy was born from a woman who just spent two years in prison, surrounded by women. This unique baby was then raised in Sardinia by a priest, grew into a young man and eventually met Donatella Una. However, the priest discovered that his foster son had kept his mother prisoner and hidden under his room. The boy disappeared, but not before killing the priest and burning his home to erase all traces of him. Back to the present, a teen named Vinegar Doppio comes to Sardinia in order to reach the Costa Smeralda and watch it. Revealed to share his body with the Boss himself, Doppio manages to learn that Risotto is near but is nonetheless surprised by assassin. Risotto quickly sees that Doppio is a Stand user as he looked at the distant Aerosmith but hasn't guesses his true nature yet. A fight ensues, during which Risotto makes razors and nails appear in Doppio's body before disappearing. The Boss then communicates with Doppio and tells him to approach the assassin, granting a part of King Crimson's power to help him.
The fight between Doppio and Risotto Nero continues. Using Epitaph's power to predict the future, Doppio manages to hit close to the now invisible Risotto and extracts scissors safely from his throat. Doppio then guesses that Risotto is using magnetism to create the razors from his body's iron. Thus he discovers Risotto's location and severs the assassin's foot. However, Risotto recomposes himself, harasses Doppio with scalpels made from the iron in the rocks and takes so much iron from Doppio that the boy suffers from anemia. As Doppio is tricked into throwing his scalpels in the wrong direction, Risotto reveals himself and creates a razor to cut into Doppio's head. Having guessed that Doppio and the Boss are split personalities and seemingly having defeated his enemy, Risotto is nonetheless suddenly shot down by Aerosmith. The Boss then appears, having revealed that he purposefully told Doppio to throw the knives at Team Bucciarati on the beach, using his anemia to hide from Aerosmith's CO2 radar. Outplayed, Risotto collapses.
Having been attacked, Bucciarati and Narancia decide to scale the cliffs to check on the enemy while Abbacchio rewinds the past with Moody Blues. Meanwhile, the Boss orders Risotto to give him back his blood but the assassin attempts a last ditch attack, which fails because King Crimson erases time. Risotto thus dies. The Boss now has to escape from Bucciarati and Narancia, who notice that someone else was here and proceed to search the area. The two eventually find someone, but it is revealed that it is a boy that someone has drained the blood off. Meanwhile, Abbacchio approaches a group of kids and helps them retreive a ball. Unfortunately, the Boss was hidden among them and kill Abbacchio. Abbacchio subsequently finds himself in the afterlife, where his former partner assures him that at the end, he upheld the morals his had. Team Bucciarati all grieve for Abbacchio but must leave the beach. However, Giorno sees that Abbacchio is holding a piece of rock, eventually discovering a negative of the Boss' face and fingerprints that Moody Blues has created. Abbacchio has fulfilled his mission.
After having acquired a mould of the Boss' face and fingerprints, Team Bucciarati research online if they correspond to anyone. Their efforts catch the attention of an unidentified man who calls them and convinces them that they are allies in the fight against the Boss, whose name is Diavolo. Showing them the Arrow and explaining the origins of Stands, this unknown man claims that the Arrows can unlock another power that could beat King Crimson. Interested, Bucciarati agrees to meet with the man in the Colosseum, in Rome. However, Diavolo learns that the team is up to something and thus calls forth his worst enforcers: Cioccolata and Secco, Cioccolata being a murderous surgeon and Secco his literal human pet. When the team arrive at a coastal village, they and the whole village begin to be affected by strange mold that grows when the victim goes down. It is Green Day, Cioccolata's Stand in action. Narancia jumps down into the team's boat, resulting in the near-death of almost everyone. Thankfully, Mista shoots the boat engine to make it explode and push Narancia up to the shores. This feat catches the interest of Cioccolata and Secco, who are filming the whole ordeal from a vantage point.
The fight against Cioccolata and Secco continues. Cioccolata now sics Secco on the team. Meanwhile, Giorno heals Narancia in the turtle, and Narancia has a conversation with Trish about Bucciarati's leadership. When Bucciarati and Mista ascend some stairs, the whole infrastructure begins to sink under the influence of Secco's Stand Oasis which can turn rock to sludge. While Mista and Bucciarati reach the parking lot, Secco continues to pursue and eventually wounds Mista. Bucciarati then jumps down the parking lot, surprising Secco and pummeling him to force him to retreat. Secco dives underground and then explains to Cioccolata that Bucciarati might be a walking corpse as he wasn't affected by the mold. Meanwhile, the group has already stolen a car and are driving to Rome. Giorno and Bucciarati use a private moment to discuss further Bucciarati's strange condition, and Bucciarati takes his status as a small blessing that allows him to fulfill his mission. They are interrupted when a mold-riddled corpse falls from them: Cioccolata and Secco have caught up in an helicopter, and the mold begins to massacre Rome's population. Secco dives to the ground but Giorno and Mista team up to stop Cioccolata's helicopter at the top of a tower. The team subsequently splits up to defeat both Stand users.
The fight against Cioccolata and Secco continues. Bucciarati has decided to handle Secco, but he then discovers that Secco has him beat in strength and speed. Overwhelmed, Bucciarati must flee in the streets of Rome. For his part, Cioccolata is stuck in his helicopter and sees Giorno and Mista arrive for him. However, when Mista sends five of the Sex Pistols to kill Cioccolata, they notice that he's disappeared and get ambushed, resulting in Mista being taken out. Giorno thus goes to rescue the Pistols with no.5 but also gets ambushed because Cioccolata has managed to cut himself into piece and survive thanks to his medical knowledge. Green Day pummels Giorno out of the helicopter but Giorno ultimately makes no.5's bullet ricochet against the blades of the helicopter and shoot into Cioccolata's head, taking him out. Cioccolata attempts a last gambit by playing dead but is ultimately foiled, and Gold Experience violently pummels him into a garbage truck. Cioccolata is defeated. Secco then receives a voicemail from Cioccolata who encourages him and Secco comes out to fight Bucciarati. Unbeknownst to them, the mysterious ally is already observing them.
The battle against Secco continues. Bucciarati is forced to retreat but is caught up. The two then discover that Cioccolata has died by observing the crowd, but Secco surprisingly takes it well as he reveals that he only followed the surgeon for his wealth and treats. Secco nonetheless decides to go to the Coliseum to take what Bucciarati is after. Bucciarati is forced to stop him but another fistfight cements Secco's superiority over Sticky Fingers. Thus Bucciarati goes underground and zips him way throught the soil to join the Coliseum, Secco swimming after him. Using his hearing, Secco relentlessly tracks Bucciarati and when Bucciarati decides to stand still, Secco then creates spikes of hardened rock that he makes rain down on the softened ground. Meanwhile, it is revealed that Jean Pierre Polnareff is the mysterious ally and that he must protect his Arrow's secret at all cost. Bucciarati is forced to move and is cornered but a car is sunk near him and he has Sticky Fingers punch the car's tire. The explosion bursts Secco's eardrums while Bucciarati is past caring about them. Resurfacing, Secco incidentally meets Doppio and takes him hostage but Bucciarati takes him out. Bucciarati then collapses as his body has reached its limits, and Doppio approaches to execute Bucciarati for good.
Instead of killing Bucciarati, Doppio decides to pass off as a harmless civilian to "help" carry Bucciarati to his destination. Diavolo enhances the ploy by deducing that Bucciarati is now a corpse who can only see spirits and emitting a bit of his own soul - Bucciarati is fooled into thinking Doppio is Trish. The two enter the Colosseum where they are confronted by Polnareff from the second floor. Polnareff eventually sees Doppio as a suspicious person, and both him and Diavolo remember Polnareff's attempt to investigate the Arrows in Italy only to be nearly killed by Diavolo in person. Polnareff forces Diavolo's hand, forcing the Boss to come out and confront him. Diavolo gets the better of Polnareff a second time, and Polnareff is forced to pierce Silver Chariot with the Arrow in front of Diavolo to protect it. Diavolo kills Polnareff and takes the Arrow. Looking down on the first floor, he sees Team Bucciarati coming to their leader and plans to kill them, but he then sees a new Stand in front of him.
Diavolo has taken the Arrow from Polnareff's corpse but is now seeing a new Stand in black walking in front of him. Soon, the entirety of Rome is put to sleep, the Stand takes the Arrow and a few hours pass. When the team wakes up, they realize that they have switched bodies. Giorno with Narancia and Mista with Trish, to Trish' dismay but the switch doesn't look like an attack as the grous is otherwise fine and they discover that there Stand abilities have been empowered. The team then meets with Polnareff, whose soul was put in the turtle Coco Jumbo. Polnareff presents himself and explains that the Arrow unlocks greater power, narrating the incident allowing him to discover that Silver Chariot could gain the power to control souls. He's been forced to completely turn Silver Chariot into Chariot Requiem and the group must now defeat it to take the Arrow. He also warns that Diavolo may be working alongside a partner. The heroes spot Diavolo and Chariot Requiem and prepare to attack - however, Diavolo then summons Sticky Fingers to attack Chariot Requiem, meaning Bucciarati is in the Boss' body.
Bucciarati who is in Diavolo's body has seemingly taken out Chariot Requiem and severed his arm. However, the team soon discovers that when they try to approach the Arrow, their Stands automatically begin to attack them. Thus, Chariot Requiem is free to take back his arm and the Arrow and walk away. The team also realize that Diavolo must be now in Bucciarati's body and shoot him when he wakes up. Despite Requiem, all seems well and Narancia thinks about his future. However, time is erased again and the team realize that Narancia has been impaled on iron bars. It is too late for Narancia and the team can only mourn their lost companion. Giorno also regains his body. For his part, Polnareff deduces that Diavolo and Doppio were split personalities, and that Diavolo's soul may be lurking nearby. The group must depart to catch up to Chariot Requiem. In the streets, Bucciarati experiments with Requiem, and Polnareff tries to grab the Arrow since he's Standless. This spurs Chariot Requiem into action who now runs towards the turtle.
The struggle to defeat Chariot Requiem continues. After Polnareff touches the Arrow, Giorno and Mista must protect him from Chariot Requiem and Mista must replace his inexplicably broken revolver with a pistol. After a short struggle, Chariot stops running after Polnareff and goes away with the Arrow, only for it to be revealed that everyone is beginning to mutate into otherworldy creatures because of Chariot. Meanwhile, Diavolo has seen Chariot's weakness. Time presses but Giorno suddenly tells everyone to be still: he's checked Mista's revolver and proves that it was sabotaged; from that he deduces that Diavolo is hiding into one of them. When Giorno checks on Bucciarati, Diavolo manifest from the same body as his daughter and attacks Giorno, severing him arm. Diavolo then catches up to Chariot Requiem, using time erasure to evade all attacks. In truth, a hidden light orb can be attacked behind each soul's head and King Crimson punches his orb to disable Chariot and take the Arrow. The group tries to prevent Diavolo from taking the Arrow, culminating in it being send in the air but King Crimson punching through his host's stomach to send himself flying toward the Arrow and kill Trish once and for all.
Diavolo almost grabs the Arrowhead, but Bucciarati intervenes. He has too seen through Chariot Requiem and definitely destroys the light orb behind him to obliterate Chariot, forcing Diavolo's soul away from the Arrow. Everyone returns to their original body and Giorno is able to heal Mista's body. Moreover, Giorno witnesses Bucciarati's soul ascending to heaven. Bucciarati explains how Giorno affected his life for the better and entrusts to him the end of their mission. Giorno thus takes the Arrow. Diavolo is bitter over his loss of the Arrow but is reassured as he forecasts Giorno being rejected. However, when Giorno stabs Gold Experience, it does turn into Gold Experience Requiem. GER performs a first attack but Diavolo foresees it and doesn't see any real change. Considering King Crimson to still be superior, Diavolo erases time. Foreseeing himself punching through Giorno, Diavolo is elated but his joy is crushed as he sees that time is rewinding back and that his time erasure is being undone. Diavolo finds himself at the same position he was just before the time erasure was activated and is powerless to prevent Gold Experience Requiem from starting to pummel him and King Crimson.
Giorno's Gold Experience Requiem soundly defeats Diavolo and King Crimson, sending them into the Tiber. Diavolo seemingly survives and climbs up to a sewer only to be stabbed by a druggie. Diavolo then continuously experiences various gruesome deaths and his spirit is eventually broken. For their part, the team is convinced that they are victorious. Mista then tells the group to go back to the Colosseum and heal Bucciarati, unaware of his death. Seeing the spirits of his fallen comrades in the sky, Giorno sees the Arrow on the ground. The plot jumps back to the past; during lunch, Bucciarati learns that Luca has just died and must investigate it. At the same time, a florist comes and claims that his daughter has been murdered by her boyfriend, explaining that she was holding a round rock in her arms. Bucciarati accepts to also investigate the matter and asks Mista to resolve the case. As Fugo drives Bucciarati and Mista to the boyfriend's apartment, Mista suspects that he is stalked by a round rock. His suspicions worry Bucciarati and when Mista goes to the boyfriend's address, Bucciarati decides to go after him. When Mista uses the elevator, he spots the boyfriend and the rock reappears, which worryingly takes the shape of a dying Bucciarati.
Mista's investigation continues. Realizing that he's pitted against a Stand User, Mista quickly overpowers the sculptor, named Scolippi, and orders him to explain himself. Scolippi is revealed to a benign Stand User whose automatic Stand Rolling Stones tracks people fated to die and preemptively kills them; Bucciarati has in fact become its latest target and is following him. Rolling Stones suddenly disappears and Mista is told by Sex Pistols that Bucciarati is nearby. Mista begs Scolippi for a solution and the sculptor suggests that he may change Bucciarati's fate by breaking the stone. Mista manages to delay Rolling Stones and ultimately jumps down the building with the Rolling Stones to break it, surviving by landing on Fugo's car. The gang leaves, but Scolippi notices that Bucciarati's fate, as well as that of Abbacchio and Narancia were already sealed. Still impressed by Mista's loyalty, Scolippi prays that their demise may serve some purpose. Back to the present, Giorno, Mista and Trish head back to the Colosseum to "heal Bucciarati". Meeting Coco Jumbo on the way back with Polnareff's spirit lingering it the room in its shell, Giorno decides to safeguard the Arrow. Some time later, it is shown that Giorno has become a gang leader.
The broadcasting schedule was momentarily slowed down three times with a recap episode being released on the week next to Episode 13 instead of Episode 14, following Episode 21 instead of Episode 22, and again following episode 28 instead of episode 29. Finally, the show went through a three-weeks long hiatus at its end, with episodes 38 and 39 being broadcasted on July 28.
The three recap episodes aired during the show's television run were excluded from all Blu-ray releases.
According to the producer Nobutaka Kasama, the show got greenlit in January 2017.
Unlike the other seasons, the Blu-ray disks do not come with extra content other than the production booklets.
In the 2020 Anime Expo interview, Kensho Ono (voice actor for Giorno Giovanna) says that during his audition, he was unsatisfied with his performance on Giorno's battlecry and asked for a redo even though the auditioner had greenlit his performance and he theorizes that it helped him get the role since it showed his commitment.