Following the success of the first two seasons, a third season of the anime entered production in May 2015. According to character designer and chief animation director Terumi Nishii, "pleasing the 'boy's love' (yaoi) fans" was taken into account when designing the characters for this season, though they retain her regular style.
Media distribution services Crunchyroll and Viz obtained the initial streaming licenses for the anime, which was made available for viewing on Crunchyroll and Viz's websites.
On July 6, 2018, an English dub of the season was announced to begin airing on Toonami. The dub was broadcast from August 18, 2018 to June 8, 2019.
Highway Star Voice Actor(s): Kisho Taniyama Voice Actor(s): Phillip Reich Voice Actor(s): Christian Strempler Voice Actor(s): Angel del Río Tasio Alonso (Highway Star) Voice Actor(s): Marco Ribeiro Voice Actor(s): Tavil Wisanbanawit Voice Actor(s): Roman Wolko
Red Hot Chili Pepper Voice Actor(s): Showtaro Morikubo Voice Actor(s): Andrew Russell Voice Actor(s): Miguel de León Víctor Ruiz (Red Hot Chili Pepper) Voice Actor(s): Angel del Río Voice Actor(s): Heitor Assali Voice Actor(s): Apichat Samutkhiri Voice Actor(s): Rainer Fritzsche
Atom Heart Father Voice Actor(s): Shigeru Chiba Voice Actor(s): Steve Kramer Voice Actor(s): Herman López Jesús Cortés (Episodes 31-38) Voice Actor(s): Pedro López Voice Actor(s): Luiz Carlos de Moraes Voice Actor(s): Gerald Schaale
Boy II Man Voice Actor(s): Chika Sakamoto Voice Actor(s): Laila Berzins Voice Actor(s): Javier Olguín Voice Actor(s): Julia Chalmeta Voice Actor(s): João Vitor Mafra Voice Actor(s): Giovanna Winterfeldt
Super Fly Voice Actor(s): Kōichi Tōchika Voice Actor(s): Sean Chiplock Voice Actor(s): Ricardo Bautista Juan Carlos González (Episode 39) Voice Actor(s): Enrique Hernández Voice Actor(s): Pierre Bittencourt Voice Actor(s): Toni Michael Sattler
Five Brazilian Portuguese voice actors who voiced characters in the Thus Spoke Kishibe Rohan OVA return for the same roles in Diamond is Unbreakable, excluding Wilken Mazzei. Mazzei was replaced by Silas Borges for the role of Mikitaka Hazekura, since he was already voicing Jotaro.
Daniel Figueira reprises his role as Koichi Hirose.
Nestor Chiesse reprises his role as Okuyasu Nijimura.
Michel Di Fiori reprises his role as Rohan Kishibe.
Giovanna Calegaretti reprises her role as Yukako Yamagishi.
Heitor Assali reprises his role as Akira Otoishi.
Tatá Guarnieri reprises his role as Tamami Kobayashi.
Two Latin Spanish voice actors who voiced characters in the Thus Spoke Kishibe Rohan OVA return for the same roles in Diamond is Unbreakable.
Irwin Daayán reprises his role as Rohan Kishibe, and also voices Jotaro.
Miguel Ángel Ruiz reprises his role as Okuyasu Nijimura.
In April 1999, roughly ten years after his battle against DIO, Jotaro Kujo travels to the town of Morioh in search of a boy named Josuke Higashikata. After Jotaro runs into a timid boy named Koichi Hirose, the two come across Josuke as the youth fights a group of upperclassmen for insulting his hairstyle. Jotaro introduces himself to Josuke, revealing that he is the illegitimate son of Joseph Joestar, and thus Jotaro's uncle by technicality. When Jotaro inadvertently insults his hairstyle, Josuke flies into a rage and attacks Jotaro with his Stand, Crazy Diamond, which can heal people and revert objects to prior states. Jotaro narrowly avoids serious injury thanks to his Star Platinum's ability to stop time temporarily. After Josuke calms down, Jotaro warns him and Koichi about a dangerous Stand user and serial killer named Anjuro Katagiri hiding somewhere in town. The next day, Josuke witnesses a hostage situation at a local convenience store, eventually being compelled to step in after his hair is insulted again. Josuke successfully saves the hostage, but discovers that the criminal was being possessed by Angelo's Stand, Aqua Necklace, whose user threatens to kill Josuke and his family.
Angelo sends Aqua Necklace into the Higashikata Family household in hopes of killing Josuke's mother Tomoko, but Josuke manages to trap it inside a bottle before it can do so. When Josuke's grandfather Ryohei comes home, however, Angelo tricks him into setting Aqua Necklace free and kills him as the Stand escapes. Josuke uses Crazy Diamond's ability to heal Ryohei's wounds, but is saddened to discover that his power is incapable of bringing back the dead. Josuke and Jotaro spend the next few days thinking of a plan to stop Angelo, but a sudden rain allows Aqua Necklace to move freely throughout the house. Angelo attempts to kill Josuke by sending Aqua Necklace into his mouth through a humidifier, but Josuke traps it in a rubber glove he had swallowed earlier. Using the Stand to find Angelo himself, Josuke takes revenge for his grandfather by fusing Angelo with a nearby rock.
Angelo reveals to Josuke and Jotaro that he received his Stand ability from a man in a school uniform who shot him with a mysterious Bow and Arrow he had received from DIO. Angelo tries to attack a nearby child with Aqua Necklace while the two are distracted, but Josuke further merges him with the rock, permanently incapacitating him. Realizing that the Bow and Arrow may have been the cause of DIO's Stand's awakening, Jotaro decides to stay in Morioh to investigate. The next day, as Josuke and Koichi pass by a seemingly-abandoned house near Josuke's house, the man in the school uniform shoots an Arrow through Koichi's neck. Before Josuke can rush to Koichi's aid, he is confronted by the man's brother, Okuyasu Nijimura, whose Stand The Hand can erase anything its right hand touches, including space itself. Josuke uses Okuyasu's power to his advantage by tricking him into launching a row of potted plants towards himself, knocking him out.
As Josuke enters the house, the uniformed man attempts to attack him with his Stand, Bad Company, only to hit Okuyasu instead. After Josuke decides to heal his wounds, Okuyasu repays the favor by helping him recover Koichi from the uniformed man, revealed to be his brother Keicho. Josuke heals Koichi, and the two attempt to escape from Bad Company, an entire army of toy soldiers complete with tanks and helicopters. The two are cornered, but Keicho demands to see Koichi's Stand, which has been newly awakened by the Arrow. Koichi is forced to summon his Stand, which appears as an egg with no combat ability. Satisfied, Keicho targets Josuke with intent to kill, but Josuke uses Crazy Diamond to redirect Bad Company's own missiles at Keicho.
Josuke and Koichi search the attic for the Bow and Arrow, but instead discover a mutated creature, who Keicho reveals to be his father. Once a servant under DIO, Keicho's father was mutated after his master's death by a flesh bud DIO had implanted into him, turning him into a monster unable to be killed by conventional means. Keicho had been creating new Stand users in the hopes of finding an ability that could kill his father, who has been doing nothing but searching through an old chest. Using Crazy Diamond's ability, Josuke discovers that the father was searching for a torn-up photograph of his family, having retained his memories and emotions. Josuke offers to help the Nijimura brothers find a way to cure their father in exchange for the Bow and Arrow, but Keicho is suddenly attacked by the electric Stand Red Hot Chili Pepper. Chili Pepper steals the Bow and Arrow and kills Keicho by dragging him through the power lines, dumping his body atop the electric cables outside. Later, Okuyasu decides to befriend Josuke and go to school with him.
As Koichi rides his bike on his way to school, he inadvertently runs over what he believes to be a cat in a burlap sack. The cat's alleged owner, Tamami Kobayashi, tries to blackmail Koichi into paying for the cat's death, using his Stand The Lock to literally weigh Koichi down with his own guilt. Okuyasu and Josuke soon arrive to help him, but Kobayashi tricks Okuyasu into feeling guilty for punching him, putting him under The Lock's effects as well. However, Josuke discovers that the cat was fake and heals Kobayashi's injuries, freeing both Koichi and Okuyasu. Kobayashi nonetheless escapes with Koichi's money. Upon arriving home, Koichi is shocked to find Kobayashi, who has tricked his mother into thinking Koichi had stolen from him and put both her and Koichi's sister under The Lock's power. Koichi's anger towards Kobayashi triggers the hatching of his Stand, Echoes, which has the ability to create onomatopoeia that endlessly replicate sounds. Koichi assaults Kobayashi with repeating sounds, but the conman tries to take revenge by tricking Koichi's family into thinking Koichi had stabbed him, aiming to drive Koichi's mother to kill herself. However, Koichi uses Echoes's ability to convince his mother to believe in him, ultimately freeing both her and his sister from The Lock's power. Following his total defeat, Kobayashi resigns himself to be Koichi's servant.
Kobayashi informs Josuke and Koichi about a Stand user in their school named Toshikazu Hazamada, who allegedly caused his friend to gouge his own eye out following an argument. While investigating Hazamada's locker, Josuke finds a wooden dummy, which soon turns into a copy of Josuke and reveals itself as Hazamada's Stand, Surface. Surface takes control of Josuke's movements and departs after seemingly incapacitating the two heroes, unaware that the two have used their respective Stand abilities to save each other. Hazamada uses Surface's disguise to call Jotaro and lure him into a trap, but Josuke and Koichi use their abilities to delay Hazamada and meet with Jotaro first. Surface takes control of Josuke once more and tries to have him kill Jotaro instead, but Hazamada is stopped by two bikers he had attacked earlier, who dish out their revenge after learning of his plans from Josuke.
Koichi meets with his classmate, Yukako Yamagishi, who confesses her love for him. When Koichi hesitates to respond, Yukako loses her temper at the thought of being turned down. After she leaves, Koichi realizes that her hair has been left behind in his drink. The next day, the class representative insults Koichi in front of Yukako, driving her to use her Stand, Love Deluxe, to manipulate her own hair in an attempt to burn the class rep alive. Josuke and Okuyasu arrive to save her in the nick of time. The two warn Koichi of Yukako's Stand and encourage him to sully his reputation to drive her off. Their plans backfire when Yukako kidnaps Koichi and holds him hostage in an abandoned summer villa, torturing him in her attempts to mold him into the perfect gentleman.
While looking for a way to escape, Koichi manages to find a payphone and use Echoes's ability to trick Yukako into contacting Josuke, giving him and Okuyasu a lead toward his location. As Koichi attempts to survive Yukako's fury, Echoes transforms into a new form, Echoes ACT2, which can turn its onomatopoeia into the effects they represent upon contact. Yukako endures several counterattacks from Koichi's new Stand ability, but is eventually blown away onto a nearby cliff, which gives way beneath her. Yukako falls toward the sharp rocks beneath the cliff, but finds herself bouncing to safety, as Echoes ACT2 had already put a bouncing sound effect on the rocks. As Koichi reunites with Josuke and Okuyasu, Yukako gains a new level of admiration for Koichi.
On the way to visit Keicho's grave, Josuke and Okuyasu visit an Italian restaurant run by Chef Tonio Trussardi, who makes dishes based on his observations of his customers. However, Josuke suspects that things are not what they seem when Okuyasu's body begins reacting violently to the food Tonio serves him, despite various maladies of his being cured shortly afterward. Josuke uses Crazy Diamond on one of the dishes to restore it to its original state, revealing Tonio's Stand, Pearl Jam. Josuke goes to confront Tonio before Okuyasu is served the next dish, but Tonio apparently attacks him as Okuyasu gorges himself. However, Tonio is just upset that Josuke went into the kitchen without washing his hands, and Okuyasu finds that his stomach has been cured of its prior troubles. Tonio tells the two customers that he started his restaurant out of his desire to help people before forcing Josuke to clean the kitchen. Meanwhile, Jotaro is informed by a Speedwagon Foundation representative that Joseph Joestar is en route to Morioh.
While at home playing video games, Josuke is suddenly ambushed by Red Hot Chili Pepper, who reveals that he has been spying on him and his friends and intends to test his Stand's strength as a warm-up for Jotaro's Star Platinum. Crazy Diamond and Chili Pepper both show off their incredible strength and speed, with Chili Pepper eventually being forced to retreat. The next day, Jotaro informs Josuke, Okuyasu, and Koichi to inform them that Joseph, whose Hermit Purple can potentially reveal Chili Pepper's user, is due to arrive at the port. Chili Pepper then appears, having heard the whole conversation from Okuyasu's motorcycle battery. Okuyasu manages to weaken Chili Pepper with The Hand, but the Stand manages to trick Okuyasu into revealing an underground power line. Empowered by the cable's electricity, Chili Pepper severs Okuyasu's arm and drags his body into the power line, announcing his intent to kill Joseph next. Luckily, Josuke is able to use Crazy Diamond on Okuyasu's severed arm, dragging his body away from Chili Pepper's clutches and healing him. Josuke and Jotaro then head to the port to save Joseph from Chili Pepper's ambush.
Jotaro and Okuyasu head to sea to rendezvous with Joseph's ship, assigning Josuke and Koichi the task of guarding the dock. Chili Pepper's user, Akira Otoishi, soon appears and confronts the two youths. Otoishi hides Chili Pepper in the underground power lines and launches surprise attacks on Josuke from all directions, but Josuke reverts the surrounding concrete into coal tar, allowing him to hinder Chili Pepper's movements and attack the Stand directly. Angered by Josuke's counterattack, Otoishi drains all of the electricity in Morioh to power Chili Pepper. However, Josuke manages to trap Chili Pepper in a tire and trick the Stand into bursting out, causing the air inside to blow the tire into the ocean. As Chili Pepper's electricity disperses into the ocean, Otoishi fakes his death, distracting Josuke and Koichi long enough to sneak onto Joseph's boat and disguise himself as a Speedwagon Foundation agent. Despite Otoishi's clever disguise, Okuyasu finds and incapacitates him, allowing Josuke to finally meet his father.
Following Otoishi's defeat, Jotaro successfully retrieves the Bow and Arrow, though he urges his allies to be careful of any remaining Stand users Otoishi created. As Josuke escorts Joseph back to his house to meet Tomoko, the two come across what appears to be an invisible female baby. After spending a fortune on baby supplies, Joseph attempts to dress the baby, only to realize that her Stand ability, Achtung Baby, makes everything within a certain radius of her turn invisible. In the ensuing confusion, Joseph accidentally knocks the baby into the river, earning Josuke's ire. As Josuke madly searches for the baby, Joseph decides to slit his own wrists, using his blood to reveal the baby's location and earning Josuke's respect... until the youth realizes how much his father spent on the baby supplies.
Hazamada and Koichi visit the house of famed manga artist Rohan Kishibe, who gives them a tour of his studio. Despite the disturbing practices Rohan demonstrates to improve his manga, Koichi and Hazamada seize the opportunity to peek at Rohan's new manuscript for Pink Dark Boy. The moment they do, however, they fall under the power of Rohan's Stand, Heaven's Door, which allows him to open their bodies like books and read and write into their pages. After learning of Koichi's encounters with Stand users, Rohan writes a safety lock in one of Koichi's pages, preventing Koichi from attacking him. The manga artist then proceeds to take pages from Koichi as material for his manga, leaving them with no memory of the attack. Later, Koichi senses something amiss when he finds that his weight has drastically fallen, but forgets about it as soon as he prepares to call Josuke. The next day, Koichi finds himself at Rohan's house again, unaware of Josuke and Okuyasu following closely behind.
Rohan reveals his plans to continue taking pages from Koichi as inspiration. Though the safety lock written inside Koichi prevents him from asking his friends for help, Josuke and Okuyasu glimpse wounds on Koichi's hand and head and deduce that he is being attacked. Okuyasu attacks Rohan, who quickly uses his manuscript to put Okuyasu under Heaven's Door's power, threatening to have him commit suicide if Josuke runs away to tell others. Rohan then insults Josuke's hairstyle in order to provoke him into opening his eyes and viewing his manuscript. Josuke nonetheless pummels Rohan, so blinded by his rage that he cannot notice the manuscript. As Josuke beats Rohan to a pulp, Koichi explains the story behind his hairstyle: when Josuke came down with a fever at the age of four, a student with a pompadour hairstyle helped him and his mother get to a hospital in the middle of a blizzard. Inspired by this random act of kindness, Josuke copied and became deeply attached to his hairstyle. As a result of the incident, Pink Dark Boy is put on hiatus for a month.
Jotaro asks Josuke to help him track down a rat that Otoishi had turned into a Stand user. While investigating a house attacked by the rat, Josuke encounters and quickly kills the rodent, despite its ability to fire flesh-melting needles with its Stand, Ratt. However, Jotaro encounters a second rat with the same ability, which escapes from the house. While pursuing the second rat, which Jotaro names Bug-Eaten, Josuke falls into a trap and is hit by one of Ratt's needles, though Star Platinum removes the needle before it can cause any lasting damage. Jotaro decides to use himself as bait to lure out Bug-Eaten, tasking Josuke with shooting the rat from afar. Despite the pressure put on Josuke by the rat's cleverness and Jotaro's increasing damage, Josuke manages to focus and successfully eliminate the rat.
Having recovered from his injuries, Rohan brings Koichi with him to investigate an alley not marked on any map of the town. The two quickly become lost, as every corner they turn leads to the same mailbox. They are then approached by a girl named Reimi Sugimoto, who reveals that both she and her dog Arnold are ghosts who were murdered fifteen years ago. Reimi explains that the alley is a passageway between the worlds of the living and the dead, and warns Rohan and Koichi that her killer is still active and at large. After the two reluctantly agree to search for him, Reimi points them towards the exit and warns them not to turn around, lest they be dragged into the afterlife. As they near the exit, Koichi is tricked into turning around, but Rohan uses Heaven's Door to allow both of them to reach safety. Later, Rohan meets an old man at Reimi's grave, who tells him that Reimi had babysat him on the night of the murder and saved him from the killer. As Koichi informs Josuke and Okuyasu about the killer, a man named Yoshikage Kira arrives at his home with a woman's severed hand.
Josuke and Okuyasu spot a group of hornet-shaped Stands named Harvest picking up loose change. The two chase the swarm back to its user, a middle school student named Shigekiyo Yangu, also known as Shigechi. After learning how much money Shigechi made from loose change, Josuke and Okuyasu convince him to use Harvest to search for discarded stickers and vouchers, promising to evenly split the cash rewards they obtain from exchanging the rubbish. During their search, the trio manages to find a winning lottery ticket worth five-million yen, a prize Shigechi is reluctant to share with Josuke and Okuyasu.
Josuke, Okuyasu, and Shigechi visit the bank to collect the lottery reward, where they successfully fool the bankteller with the aid of Crazy Diamond and manage to claim a promissary note for the prize. However, Shigechi claims the note for himself and attempts to escape Josuke and Okuyasu before they can stop him. As the two heroes chase after Shigechi, Harvest injects alcohol into their veins, causing them to become drunk and defenseless. Outnumbered by Harvest, Okuyasu uses the lure of money to draw Shigechi close enough to take back the note, which Josuke rips into shreds and scatters in the wind. Shigechi quickly sends Harvest out to recover the pieces of the note, realizing too late that he has left himself defenseless before two drunk teenagers. After beating some sense into him, Josuke uses Crazy Diamond to restore the note and convinces Shigechi to split the money evenly.
Still yearning for Koichi's affection, Yukako stumbles across a aesthetician named Aya Tsuji, who promises to adjust her face slightly to make Koichi fall for her, courtesy of her Stand Cinderella. The treatment proves effective but short-lived, compelling Yukako to agree to a full body treatment that requires her to apply lipstick periodically. As a result of her new beauty, Yukako manages to share a kiss with Koichi, who finds himself falling in love with her. However, after forgetting to apply the lipstick during the kiss, Yukako's modifications begin to turn repulsive and fall apart. Yukako is on the verge of attacking Aya when Koichi arrives, having recognized Yukako from her personality. Aya challenges Yukako with picking her own face out of several copies she has made, with the wrong one doomed to leave her ugly forever. Yukako decides to leave the decision to Koichi, who offers to let Aya blind him if he fails. Sensing Koichi's true love for Yukako, Aya ditches her original plan to trick the two and allows Koichi to choose the correct face, restoring Yukako to her original appearance and unifying the new couple.
Kira goes with one of his victim's severed hand to buy a sandwich, hiding it inside the shop's paper bag. Just then, Shigekiyo, who had bought a sandwich from the same shop, ends up picking up Kira's bag containing the severed hand by mistake. Fearing that the police will trace the hand back to him if discovered, Kira tails Shigekiyo in the hopes of taking his bag before he can look inside. Following him into the gym, Kira is forced to hide when Josuke and Okuyasu show up to eat their lunch as well. Kira manages to get a hold of the bag but is discovered by Shigekiyo after he uses Harvest to search for it, leading to him discovering the hand. Refusing to let Shigekiyo escape alive, Kira brings out his own Stand, Killer Queen.
Kira uses his Killer Queen's ability to turn anything into a bomb, using a coin to deal heavy damage to Shigekiyo. Shigekiyo attempts to escape in order to reach Josuke, but Kira catches up to him, using a doorknob as a bomb to kill him. In his final moments, Shigekiyo has one of his Harvest bring Josuke a button that came off of Kira's jacket. Having seen Shigekiyo's soul pass by her realm, Reimi confirms to Josuke and the other allied Stand users that Shigekiyo was killed by the same person who murdered her, who they quickly realize is another Stand user. A few days later, Jotaro and Koichi go to a shoe shop where button's is having their jacket repaired. Just as the owner attempts to reveal his customer's name, Kira kills him using his Killer Queen's second bomb, Sheer Heart Attack.
Advising Koichi against recklessly chasing after the culprit, Jotaro goes up against Sheer Heart Attack, which proves to be resilient to Star Platinum's attacks. Ignoring Jotaro's warning, Koichi sends Echoes to search for the jacket's owner, only to find he can control Sheer Heart Attack from outside Echoes' range, leaving him open to an attack from Sheer Heart Attack. Deducing that Sheer Heart Attack uses body temperature to determine its primary target, Jotaro uses a fire to lure it away from Koichi, but gets critically injured by its explosion. Thinking things carefully, Koichi manages to use Echoes' ability to distract Sheer Heart Attack while he contacts Josuke. As Koichi is once again pursued, Echoes evolves into its third form, Echoes Act 3, using its new ability to increase Sheer Heart Attack's weight and stop its movements, forcing Kira to set off to retrieve it.
While Josuke and Okuyasu make their way to the scene, Kira appears before Koichi, knocking him out of Act 3's range and undoing the gravity on Sheer Heart Attack. Taking advantage of Act 3's limitations, Kira brutally beats Koichi, who uses the opportunity to learn Kira's real name. Just as Kira deals a lethal blow to Koichi and prepares to kill him using Killer Queen, Jotaro manages to stand up long enough to stop Kira and give him a pummeling. As Josuke arrives with Okuyasu to heal Jotaro and Koichi, Kira chops off his own hand to set Sheer Heart Attack loose and escape. Using Crazy Diamond's ability to have Sheer Heart Attack reunite with Kira's hand and try to rejoin his body, Josuke and the others follow it to Salon Cinderella, where they discover Kira has killed Aya after forcing her to replace his face with another person, allowing him to take on a new identity and hide once again.
Josuke and the others search through Kira's house, learning that he had been keeping a record of his toenail clippings since his murder of Reimi. Just then, a camera takes a picture of them containing the ghost of Kira's late father, Yoshihiro. Using his Stand, Atom Heart Father, Yoshihiro traps Josuke and Jotaro within the confines of the photograph, with any damage done to the photo dealt to them as well. Jotaro manages to trick Yoshihiro into taking a picture of himself, freeing Josuke and Jotaro and trapping himself in a separate photograph. However, Yoshihiro manages to trick Okuyasu into setting him free, managing to retrieve another arrow that Kira had in his possession as he makes his escape. Elsewhere, Kira begins living under the new identity of the man whose face he stole, Kosaku Kawajiri, moving into his house with his wife Shinobu and their son Hayato.
Yoshihiro decides to use the arrow to make more Stand-wielding allies, first using it on a boy named Ken Oyanagi. Ken then pesters Rohan to play Rock paper scissors with him, losing his first match after Rohan uses Heaven's Door to figure out his move. As Ken continues to force Rohan to play RPS with him and manages to win his third match against him, his Stand, Boy II Man, appears and tries to suck in Heaven's Door. Rohan soon learns that Ken's Stand allows him to steal energy from others and keep it if he wins three times out of five, discovering that he has already gained a third of Heaven's Door's ability. Ken then wins the fourth match, gaining more of Heaven's Door's ability and evening the score. After holding on with a pair of ties, Rohan manages to win his third match and retrieve Heaven's Door after borrowing Shizuka the invisible baby from Joseph and having her change what Ken attempted to throw out. Ken attempts to kill himself by jumping in front of the truck, but Rohan manages to use his own brand of luck to save him, convincing Ken to stop using his Stand for evil.
Josuke and Okuyasu come across a peculiar person named Mikitaka Hazekura who claims to be an alien. Believing his claims to be a joke, Josuke initially suspects him to be a Stand user when he exhibits some strange abilities. However, upon being distressed by the sound of sirens, Mikitaka suddenly transforms his body into a pair of sneakers and flees with Josuke, who realizes he is not a Stand user as he cannot see Crazy Diamond. Looking to take advantage of Mikitaka's transformation ability, Josuke has Mikitaka transform into some dice and challenges Rohan to a game of Cee-lo in the hopes of winning some money off of him. As the match begins, Josuke grows worried when Mikitaka seems to get suspiciously ideal rolls.
Becoming suspicious of Josuke's winning streak, Rohan stabs his own finger, staking two million yen against Josuke's own finger to determine how he is cheating while also calling upon Tamami Kobayashi as an official to prevent Josuke from playing normally. Just as Mikitaka becomes unnerved by sirens and starts to lose his transformation, Rohan is distracted upon discovering he had accidentally set his house on fire, allowing Josuke to escape without being discovered. The next day, while riding a bus through a tunnel with Josuke, Rohan spots a window to a room revealing a man cutting off a woman's hand, believing it to be Kira. Returning to inspect the tunnel, Rohan discovers the room to be an illusional trap, suddenly finding himself attacked by a nutrient-sucking Stand named Highway Star. When Josuke comes to the tunnel, Highway Star tries to use Rohan to lure him into his room. As Josuke ignores Rohan's warnings and enters the room anyway, Rohan sends him flying out of the tunnel, urging him to flee from Highway Star and find his user.
Believing there is a connection between Highway Star's user and the Futatsumori Tunnel he resided in, Josuke gets in contact with Koichi, who suspects the user to be someone hospitalized from a traffic accident stealing nutrients to heal himself. While Josuke makes his way to the hospital while keeping ahead of Highway Star, Koichi manages to find out the identity of its user, Yuya Fungami. Despite being caught by Highway Star upon reaching Yuya's room, Josuke manages to recover his nutrients with an IV drip, healing Yuya's injuries so he can pummel him without guilt. Meanwhile, at the Kawajiri household, Shinobu finds a British Blue cat hanging around the basement.
Upon discovering the cat to have a hole in its throat, Shinobu sends Kira down to the basement, where he discovers the cat had been killed by glass shards during its struggle with Shinobu. After being buried in the garden, the cat mysteriously comes back to life in the form of a strange plant known as Stray Cat, possessing the ability to control air. Discovering Stray Cat to be the cat from earlier and realizing it has a strong grudge against Shinobu, Kira ends up shielding her from its attacks, eventually stopping it by appealing to its cat-like nature. The next day, Hayato discovers Stray Cat while investigating the attic, coming under attack after he exposes him to sunlight. Managing to use Stray Cat's air attacks to put it back to sleep, Hayato barely manages to avoid being discovered by Kira, who he realizes isn't his real father.
Yoshihiro, recognizing Kira in his new appearance, notices he is being followed by Hayato. Later, on July 15th, Josuke and Okuyasu come across Mikitaka, who spots a Stand user named Toyohiro Kanedaichi living on an electrical pylon. When Josuke spots Yoshihiro with him, he steps inside the pylon and falls under the spell of Toyohiro's Stand, Super Fly, becoming trapped inside until someone else takes his place. Josuke and Okuyasu attempt to destroy the pylon, only to discover it dishes out any damage it takes. Wanting to help, Mikitaka confronts Toyohiro, helping Josuke escape but becoming trapped himself. Meanwhile, as something troubling happens in the Higashikata household, Rohan, who had noticed Hayato's behavior, is approached by a strange man.
Rohan is greeted by Masazo Kinoto, an architect sent to evaluate the damages done to his house, using his Heaven's Door to find nothing suspicious besides an aversion to people looking at his back. Meanwhile, Josuke climbs up the pylon to rescue Mikitaka and confront Kanedaichi, who uses calculative cuts on the pylon to attack Josuke from all angles. However, Josuke manages to use Crazy Diamond's healing ability to send the bolts of energy back to their origin and defeat Kanedaichi. Resigning himself to stay inside the pylon, Kanedachi reveals that he heard Yoshihiro say that another Stand user has allegedly eliminated Koichi. Enlisting Yuya's help in tracking Koichi's scent in exchange for healing his injuries, Josuke encounters the Stand user, Terunosuke Miyamoto, who unbeknownst to him had used his Stand Enigma to turn Koichi and Tomoko into pieces of paper after witnessing their ticks when they are afraid.
Overcome by his curiosity, Rohan lays a trap for Kinoto so he can see his back. The moment he does, however, a Stand possessing its own will named Cheap Trick bursts from Kinoto's back and attaches himself to Rohan's back instead, demanding that he burn the pictures he had taken of Kira suspects. Meanwhile, Miyamoto reveals that he has trapped Koichi in a piece of paper, managing to prompt Josuke into biting his lip and falling under Enigma's power himself, becoming trapped as well as a result. Despite not wanting to get involved, Yuya becomes moved by Josuke's resolve and goes after Miyamoto, encountering several paper-hidden traps that eventually culminates in a shredder that threatens to shred both Josuke and Koichi. Despite being overcome by fear and falling under Enigma's power, Yuya manages to take advantage of his now paper-like state to reach into the shredder and free Josuke and Koichi, who quickly deliver their vengeance on Miyamoto who winds up in the form of a book.
Unable to get Koichi to take him seriously without exposing his back and passing Cheap Trick onto him, Rohan attempts to make his way to Morioh Grand Hotel without letting anyone see his back. Cheap Trick attempts to attract several cats and dogs to attack Rohan and witness his back, but they are shooed off by Koichi, who eventually comes to believe Rohan's story. Koichi attempts to forcibly remove Cheap Trick using Echoes ACT3, only to discover that doing so will damage Rohan as well. Despite this, Rohan succeeds in his ultimate goal to lure Cheap Trick into Reimi's Ghost Alley and trick him into turning around, getting dragged into Hell by the alley's hands as a result. Meanwhile, Hayato witnesses Kira killing a couple with his ability and catches it on film, something that Kira is quick to notice. Kira confronts Hayato and prepares to kill him, only for Hayato to reveal he has set up further cameras and videotapes that would threaten to expose his identity.
Kira inadvertently kills Hayato before learning from Yoshihiro that Rohan and the others now have Kosaku Kawajiri as one of their suspects. As Kira becomes anxious over what he should do, he is suddenly impaled by Yoshihiro's Arrow, giving Killer Queen a new ability. The next morning, Hayato appears alive and well, as if nothing had happened to him the previous night, noticing Kira has a strange confidence about his position. Later that morning, Hayato comes across Rohan, who uses Heaven's Door to read his memories. After reading several pages predicting occurrences moments before they happen, Rohan comes across a page revealing Kira's identity. It is at this moment, however, that Kira activates the third bomb that he had implanted in Hayato, Bites the Dust, which is set to kill anyone who learns about Kira's identity through Hayato. As the explosion goes off inside of Rohan's body, Hayato suddenly finds himself sent back in time to an hour earlier due to Bites the Dust's effects.
Hayato tries to avoid meeting Rohan, only to discover the events that occurred last time will still happen even without him being there, resulting in Rohan's death by Bites the Dust's explosion. When Josuke's group arrive at the scene shortly afterwards, Hayato attempts to kill himself to avoid being found out. However, he is stopped by Killer Queen, who sets off Bites the Dust in Josuke and the others and once again returns Hayato to the start of the morning. Realizing that he can only stop Kira by either killing him or forcing him to undo Bites the Dust, Hayato hides Stray Cat in his backpack, launching a surprise attack on Kira when he follows him later in the morning. However, because of a slight alteration of events due to Hayato's actions, Kira manages to protect himself from Stray Cat's attack with a watch he had put in his jacket.
As Kira brags about his victory to Hayato, he unknowingly reveals his own identity to Josuke, who Hayato had secretly called ahead of time. Needing Killer Queen to protect himself, Kira is forced to undo Bites the Dust, preventing Rohan from being killed by its effects. Engaging in battle against Josuke and Okuyasu, Kira manages to retrieve Stray Cat and use its air shots to create invisible remote bombs, dealing heavy damage to Okuyasu. As Josuke tries to reach Okuyasu in order to heal him, Hayato deduces that Okuyasu's body might have been turned into a bomb, leaving Josuke with the tough decision of whether to sacrifice himself to save Okuyasu. However, Hayato, deducing that Kira can only set off one bomb at a time, sets off the bomb on himself, allowing Josuke to heal both him and Okuyasu. As Kira launches another air bomb, Josuke, refusing to believe Okuyasu might already be dead, manages to use Crazy Diamond on debris in his wounds to dodge the explosion.
Despite Josuke and Hayato hiding inside the house, Kira manages to figure out Josuke's location and send an air bomb after him. Although Josuke gets hurt in the explosion, he manages to use his hardened blood on a vase fragment, turning it into a homing bullet that manages to hit Kira. Noticing Kira carrying a cell phone with him, Josuke deduces that Yoshihiro had been hiding in Hayato's pocket, informing his son of their location, and tricks Kira into killing him instead. Josuke then draws Kira into a close quarters fight, but Stray Cat manages to protect Kira from Crazy Diamond's attacks. Just as Josuke is about to be hit by another air bomb, he is saved by a very much alive Okuyasu, who retrieves Stray Cat from Kira, driving him further into a corner as Jotaro and the others arrive on the scene.
Surrounded by ambulances and fire engines, Kira attempts to use an approaching nurse to activate Bites the Dust again. While initially believing himself to have succeeded, Kira finds himself in Ghost Alley. There, Reimi reveals to Kira that he had in fact died after he was stopped by Koichi and Jotaro and run over by an ambulance. Thanks to the combined efforts of Reimi and Arnold, Kira is forced to turn around and is dragged into the underworld by the alley's hands. No longer bound to her attachments, Reimi and Arnold bid farewell to everyone before moving on to the next life. The next day, Jotaro and Josuke return home as the summer of 1999 draws to a close for the residents of Morioh Town.