Introduced in the "Dolomite's Blue Lagoon" story arc, Mamezuku is a reclusive plant appraiser, secretly employed by the Higashikata Fruit Company and only known by Norisuke Higashikata IV. Once attacked by the Rock Humans, he joins with Josuke Higashikata in order to protect himself.
Mamezuku is a well-built man of above-average height with a bright flat top haircut that fades into dark braids behind his head. He wears a jumpsuit with a vine and peapod pattern over a light-colored shirt and a tie, as well as a bomber hat with seven small balls resembling a bunch of grapes on the front of the hat. In his first appearance, in a photo, he had freckles on his nose and two more braids hanging behind his back.
Rai Mamezuku is an eccentric and brusque individual with little care for politeness. He is highly analytical and quick-witted in his way of approaching problems. As soon as he learns of what is happening in Morioh and that he is under attack, he takes the initiative in joining with his allies. With a single phone call with Norisuke about Josuke's confusing issue, Mamezuku manages to grasp the stakes for every party involved and see the best course of action for him. He tends to carefully observe his surroundings and verbally takes notes of everything remotely interesting to him; this habit allows him to discern the nature and subtleties of the attack against him. Mamezuku also regularly calculates probabilities, like the chances of someone being safe through selected factors.
Mamezuku is very coldhearted in his methods, repeatedly showing that he has no qualms about sacrificing a perceived less important part for a greater goal. His orchard specifically leaves a small part of the culture overridden with predatory insects and disease to better the rest of the orchard, he has no problem cutting off some of his fingers to save himself, and even puts Yasuho in great danger because he sees her as less important than his own safety. Another example of his ruthlessness happens when he deliberately makes a prisoner see Satoru Akefu to make the man hurt himself and have a chance to escape jail and be secretly brought to the TG University Hospital.
Moreover, Mamezuku is very cool-headed. Despite being introduced under attack by an unknown ability, he acts calmly despite an open focus on his survival. Once on relatively safe grounds, Mamezuku even takes the time to cook a snack for him, Josuke, and Yasuho. When he loses his left hand to a Stand attack, he calmly severs it to preserve the rest of his body. That said, even Mamezuku cannot stay calm when Akefu hints that he was behind the death of Mamezuku's father as well as all the calamities that destroyed his parents' orchard, and he hastily tries to kill the hospital director.
However, Mamezuku's most noticeable trait is his eccentricity and bluntness. First, he is extremely antisocial. His only relationship is with Norisuke, whom he nonetheless considers a good friend. Mamezuku takes many steps in order to stay isolated, as his home during the summer is actually a support pillar for a ski lift, complete with at least a hidden kitchen and a whole mountainside as his orchard; during winter he resides in a villa. Moreover, Mamezuku constantly demonstrates a lack of care for others. He hijacks a bus without a second thought but the repercussions on him, openly tells Yasuho that he doesn't care about her tragic story and considers his survival as the priority, that of Josuke and Yasuho being second to his. Nonetheless, he seems impressed when Yasuho takes the initiative in covering their tracks and has thought of inviting his guests for a snack while they discuss their next move. It doesn't stop Mamezuku from condemning Josuke when the latter instinctively prioritizes Yasuho's safety in the midst of an attack. He goes as far as coldly pushing Yasuho off the ski lift into the range of the enemy Stand to observe what happens.
In his youth, Rai was described as a moody boy who disliked people and blamed his parents' mistake on the destruction of their orchard. A second flashback shows that he was at least on great terms with Norisuke IV.
- Main article: Doggy Style
Mamezuku's Stand is Doggy Style, which can create a prehensile bandage-like string from his body in order to grab objects from afar. It unravels his body into "wire rope" that he can control and manipulate.
Mamezuku is an expert in horticulture, his profession being a plant appraiser and a fruit grower, implying a great deal of knowledge and experience on plants. He can identify a plant simply from its appearance in a photograph, and has the knowledge on how to properly care for rare plants such as the Locacaca.
It is eventually revealed that Mamezuku is aware of the existence of the Spin. He demonstrates this to Josuke by letting down a rope of his skin and letting it twirl around rapidly, revealing to Josuke that Soft & Wet's soap bubbles are actually soft lines that spin around.
Mamezuku was born into a family of fruit farmers, whose high-class pears were prized goods.
In a flashback, the cultivating techniques of Mamezuku's parents were leaked, leading to a competitor managing to steal an entire crop of pears and bringing down the fruit trees. The usurpers were connected with local money lenders. Thus, his parents had to part with their orchards. Blaming his parents, Mamezuku began to live alone on a ski slope.
In another flashback, Mamezuku's family seemed to have been acquainted with the Higashikata Family. At some point, the pear orchard had been ravaged by a typhoon and a strange phenomenon occurred where the trees leaked asbestos from all their orifices as they grew. Mamezuku insists that he saw an insect harm the orchard but no one believed him. However, his father went to investigate the fruits during this typhoon and was killed by a landslide. In 1994, Norisuke Higashikata IV attended the funeral with his son Jobin and daughter Hato. During the ceremony, Mamezuku was pestered by some acquaintances but Norisuke got rid of them. After hugging Norisuke for comfort, Mamezuku told him again that the orchard was well-raised and that he saw a strange insect lurking in the orchard while the trees died. However, Norisuke refuted his claims as he checked and saw no insect, and told Mamezuku that everything that had happened to him was some natural calamity.
At that moment, although it was very brief and hardly noticeable, it was here that young Mamezuku met Satoru Akefu, who was standing with his back turned. However, Mamezuku had duties to attend to and forgot about the strange man.
3 years later, in 1997, Mamezuku met Norisuke Higashikata IV again at 17, cultivating his own fruits despite the difficulties. Impressed by their quality, Norisuke appointed Mamezuku in secret to be his personal fruit grower and appraiser. Mamezuku's existence in the company was kept with the utmost secrecy, with not even Norisuke's own son Jobin ever being informed.
Mamezuku is first shown when Norisuke presents a photo of him to Josuke Higashikata, advising the latter to go find him, as his skills would enable Josuke to recognize the grafted Locacaca branch.
After communicating with Norisuke in regards to a certain Josuke Higashikata's inquiry about a Locacaca branch, Mamezuku notices that he is under attack from an unidentified enemy moving underground. Running from his assailant, Mamezuku ends up hijacking the bus that Josuke and Yasuho Hirose are on, formally meeting them and presenting himself in the process.
Mamezuku thus drives to his summer home in the mountains, a ski lift. Discussing with Josuke and Yasuho, Mamezuku manages to find the location of the Locacaca using photographs of the orchard, and determines that the best course of action for his survival is to work with Josuke.
After a brief snack, the trio is attacked by the unknown assailant revealed to be a duo of Rock Human and Rock Animal, Urban Guerrilla and his pet Doremifasolati Do. Losing several fingers to a first attack, Mamezuku becomes upset that Josuke has protected Yasuho first instead of him. To observe the enemy, Mamezuku pushes Yasuho down the ski lift, which pushes Josuke to also jump down, although Mamezuku tells him they have to take a fuel tank stored inside one of the lift poles.
Separated from his allies, Mamezuku is attacked by Urban Guerrilla and falls down the lift, heavily injured. However, he's managed to pierce the fuel tank and bring it to Josuke alongside his lighter, which Josuke uses to make Doremifasolati Do and Urban explode.
Afterward, Mamezuku takes with him a vivarium full of moth larvae. When he tells Yasuho to leave and go home, Yasuho refuses and begins to tell her story. Uninterested by her, Mamezuku nonetheless listens when Yasuho theorizes that the strange hair clip which has tormented her may have been a Rock Animal. Thus, he sends her to investigate it.
Arriving at the Higashikata estate through secret underground tunnels, Mamezuku and Josuke stealthily manage to plant the moth larvae in the Locacaca branch and must now wait 12 days before a new fruit grows.
Their departure is interrupted when they notice the atmospheric pressure growing inside the tunnel. Looking outside, the two see the orchard on fire and decide to use giant bubbles to protect themselves from Ozon Baby's power. Going out into the open to take the branch, Mamezuku sees the enemy, Poor Tom, and decides to confront him.
Mamezuku's attempts to break Poor Tom's neck by strangling him with his wired arm proves to be a mistake as touching Poor Tom directly increases Ozon Baby's influence on him. When Poor Tom traps a part of the wire inside a knife sheath to simulate a closed space, Mamezuku succumbs to the pressure, making his body explode.
Despite all observing parties assuming that the plant appraiser was killed by the explosion, Mamezuku was able to successfully utilize Doggy Style in order to disassemble his body rapidly, giving the impression that he was torn to shreds. After the conflict with Poor Tom ends, Josuke discovers a surviving yet disassembled Mamezuku and mourns the loss of the branch, not knowing that Jobin had obtained it covertly.
After the battle, Josuke explains what happened to the Higashikata Family. Mamezuku suspects Jobin of lighting the orchard on fire, but none of them have any proof of what happened. They decide to follow the trail of the ambulance's license plate. Finding that no such ambulance is recorded, Josuke finds another trail when Yasuho calls him to go to the TG University Hospital.
Arriving there with Josuke, Mamezuku spends some time searching for Yasuho while at the same time, she is busy fighting Dr. Wu Tomoki alongside Mitsuba Higashikata. Tipped by Yasuho's ex-boyfriend Toru, Josuke and Mamezuku reach the secret laboratory containing several Locacaca branches. After Josuke saves Yasuho, Mamezuku scans the room and deduces in his turn that the stolen Locacaca branch isn't in the laboratory and destroys the trees of the garden.
Although Yasuho theorizes that since Tomoki tried to gain control of Mitsuba, he may have suspected Jobin as the possessor of the branch, Mamezuku is adamant about the branch being in the hands of the Locacaca Organization and stays deaf to her suggestions. He instead reports his attention to the last member of the organization unaccounted for: Satoru Akefu, the hospital director of TG University Hospital. The trio are eventually informed about the hospital director walking away behind them, but to Mamezuku's frustration, the supposedly 89 years old doctor keeps evading them as they continuously bump against objects, Mamezuku being the most subjected to these occurrences.
As the doctor leaves the hospital grounds, Mamezuku notices that his legs are being shredded and that the group is under attack from an enemy Stand. Warning against continuing the pursuit, he helplessly watches a car almost crash into Yasuho and Josuke as they pursue the hospital director, who has now boarded a bus. Moreover, Josuke gets into trouble when a patient nearby starts a fight, and his broken neck violently and suddenly snaps on Josuke, making it look like he murdered the man. A crowd gathers and the police arrive as Mamezuku, unwilling to be arrested, tells Yasuho to get away while he and Josuke must find a way out of this situation.
Mamezuku and Josuke eventually decide to hide inside a Lamborghini, itself also hidden in the foliage of a tree. They last until two days before the harvest. Having bought some supplies, Mamezuku stitches himself up and also discovers that Satoru Akefu may be attending a lecture on regenerative medicine at the TG University Hospital. At the same time, he and Josuke discuss the exact nature of Satoru Akefu's Stand. Once they decide to actually go to the lecture, Akefu's Stand reappears, making them realize that it is triggered by the intent of pursuit. As they worriedly leave the car to escape the incoming attack, Mamezuku and Josuke discover with horror that the drops from an incoming rain become lethal projectiles, forcing them to take refuge in a police car.
Determined to get to the hospital and reach Satoru Akefu's lecture, Josuke steps out of the car and gets pierced by the raindrops on purpose to be injured and taken to the hospital. Shocked, Mamezuku notices that the attack has ended with Josuke being taken out, or worse, and angrily yells at the police to get an ambulance. Mamezuku is apprehended by the police.
Mamezuku thinks about the enemy's ability and enacts his evasion plan. He begins by stealing a mobile phone and a kitchen knife from the evidence locker and smuggles them inside his cell.
Sitting with another prisoner who complains about his constant mumbling, Mamezuku mentions that he's innocent and was only sheltering his equally innocent friend Josuke and then inquires about his cellmate's health. This enrages the man who only wants to be left in peace but then Mamezuku mentions the power of the hospital director Satoru Akefu. Mamezuku shows the mobile phone and the kitchen knife and states that he's free to go outside but must stay in the cell. Filming the exterior with the phone, Mamezuku shows the screen to the cellmate and mentions the elderly man in a black suit standing near the window but with his back facing them. The cellmate shouts that there isn't anybody but Mamezuku insists, theorizing the figure to be a materialization of "calamity energy". To prove his point, Mamezuku stands up to get a good look at the man but a cup of water suddenly spills on the floor and the light breaks, sending shards flying at them. He also tries to call Josuke to inform him about the enemy and his dish bursts, revealing a swarm of maggots.
Thus, Mamezuku claims that the man is a form of karmic retribution whose energy is probably related to the deeds of the individual who sees him. Mamezuku finally manages to make his cellmate see the doctor and mentions that he's found photos of a knife attack in the phone incriminating the cellmate. Pushed over the edge, the cellmate takes the knife but Mamezuku unravels his hand and pushes the knife into the cellmate's throat, stating that he's been waiting for this moment. The police rushes the injured criminal to the hospital. When the ambulance reaches the TG University Hospital grounds, Mamezuku gets out of his hiding spot, as he's unraveled himself to hide under the cellmate's clothes. Still, he can see the figure of the hospital director in the parking lot. Mamezuku expresses his final finding: that the figure is actually the Stand and that the real user is hiding somewhere. However, Mamezuku spots the real Satoru Akefu walking behind him this time, and deduces that he and the doctor are going in the same direction: towards Josuke.
As Mamezuku and Akefu both go towards the laboratory, Mamezuku is able to see more of how the Stand Akefu moves through objects and reflections. Arriving at Josuke's room, he warns Josuke about the hospital director and its calamitous powers, but Josuke has a plan. Akefu phases through the wall to peek inside the laboratory but doesn't completely enter the room. Instead, it brings a Rock Insect named Do Do Do, De Da Da Da out of his pocket. It attacks Josuke via a strange method but Josuke manages to avoid taking serious damage. Akefu dares him to get up from his chair. However, Josuke retorts that this is the latest of a series of attempts to bring them out in the open. Thus, Josuke asks a question: wouldn't it have been enough to just keep the new Locacaca? Akefu remains silent, allowing Mamezuku to realize that Akefu does not have the fruit.
Suddenly, Mamezuku remembers his past and that he'd already seen Satoru Akefu. Remembering his family's devastating pear orchard and the Rock Insect, Mamezuku then saw Josuke excreting asbestos. Remembering how his trees died, Mamezuku protects Josuke from Do Do Do, De Da Da Da's second attack by blocking the stick with his palm, injuring himself in the process, and telling Josuke not to move. He explains that moving up must trigger the appearance of the asbestos, and the hospital director, who identifies himself as Wonder of U, precises that the trigger is to extend one's limbs, just like how the Mamezuku's pear trees died leaking out asbestos as their branches grew. As Wonder of U practically reveals he's been responsible for the orchard's destruction and his father's death, a dark determination appears in Mamezuku's eye. However, he must first warn Josuke of an incoming attack from Do Do Do, De Da Da Da, who's merged with the desk Josuke is perched on.
Mamezuku first tries to warn Josuke but the latter is overwhelmed by Do Do Do, De Da Da Da. Mamezuku thus intervenes personally. By unraveling himself partially, Mamezuku is able to crawl on the ceiling like a snake and take Do Do Do, De Da Da Da by surprise. Mamezuku violently extends his fingertip and impales the Rock Insect, killing it. Despite Josuke's wish to let Wonder of U come to him, Mamezuku directly confronts the hospital director, waving his fingertip mere centimeters away from it. Wonder of U taunts Mamezuku about the calamities that had befallen his family. Angered, Mamezuku grabs Wonder of U by the neck and almost impales him. However, a calamity happens and Mamezuku falls into Josuke's trap, several spinning bubbles that cut chunks of his body, including the head. Mamezuku collapses but decides to tell Josuke the truth about Soft & Wet's power, and reveals to him the existence of the Spin, dying afterward.
Mamezuku's body lies still as Josuke engages Wonder of U. His spirit guides Josuke about the ability of the spin and explains how it could bypass the calamity. Kei Nijimura joins the battle to assist Josuke but gets incapacitated by the calamity. Her help reveals the hidden ability within Josuke's bubbles. His and Kei Nijimura's hands are seen grabbing onto Josuke. The fight reaches its climax as Josuke succeeds in using the spin with his stand's bubbles. With Wonder of U out of the fight, Josuke walks over to Holy Joestar-Kira's room and takes a moment to think about her, Mamezuku, and Nijimura.
- Father: Due to Mamezuku's parents' incompetence, Mamezuku ran away to live on his own. However, it's shown that Mamezuku still has a love for his parents, especially his father, since Mamezuku at some point attended his father's funeral. After finding out that the landslide that struck his father was a calamity caused by Wonder of U, his father's death becomes one of the primary factors that drive Mamezuku's intentions on fighting Akefu.
- Mother: Due to Mamezuku's parents' incompetence, Mamezuku ran away to live on his own. Mamezuku's relationship with his own mother remains unclear, though she attended Mamezuku's father's funeral with Mamezuku. Later on, overwhelmed by the amount of debts from the pear orchard, she fell ill and died. Like the case with his father, Mamezuku becomes enraged after learning that his mother's death was also a calamity by the hospital director.
Friends and Allies
- Norisuke Higashikata IV: Mamezuku met Norisuke at the age of 17. Norisuke became impressed at Mamezuku's fruit-cultivating skills, and therefore hired Mamezuku to be his secret personal fruit grower and appraiser. Since then, their secrecy remains unnoticed even by the eldest son Jobin. It is shown that Norisuke assumes a father figure role to Mamezuku, as he attended his father's funeral, and was there to comfort him.
- Josuke Higashikata: They ally together due to their connection with Norisuke, and so that Mamezuku could tell Josuke where the New Locacaca branch is. They still get along with each other regardless.
- Yasuho Hirose: Despite Yasuho helping Mamezuku investigate the Rock Organisms and the Locacaca, Mamezuku shows little to no care for Yasuho. During their encounter with Urban Guerilla and Doremifasolati Do, Mamezuku pushed her off as a disposable, ignoring Josuke's angry reaction. They still seem to get along with each other regardless.
- Do Do Do, De Da Da Da: Mamezuku does not directly consider Do Do Do, De Da Da Da an enemy, though in his past he saw the Rock Insects infest his father's pear orchard with asbestos. It is unclear if one of them was Do Do Do, De Da Da Da. Mamezuku kept trying to tell the public about this, but they didn't believe him; only his father did.
- Satoru Akefu: Akefu did attend Mamezuku's father's funeral at some point; it was very brief, but it was here that Mamezuku and Akefu met each other for the first time. After finding out that the landslide that claimed his father's life was a calamity caused by Wonder of U, his father's death becomes the primary factor that drives Mamezuku's intentions on fighting Akefu.
- “I'd like to avoid any more irregularities, but... Josuke... no matter what happens, I need you to take responsibility. For now, you have to protect me. The priorities here are protecting me first, then your own life comes second. She's third.”
- “The entire chairlift is my home. It's just a rental though. Starting from the bottom, the first pole is where my analog records are stored. I'm thinking about throwing away my laserdiscs. Every pole is equipped with speakers. The second pole is a library and a winery. The third pole is a closet where I keep my shoes and clothing.”
- “Humans started engaging in agriculture approximately 10,000 years ago. At first, they grew wheat and green peas. From there, human civilization has been constantly developing. Right now, developments in science and technology, terrain and natural environments, art, thinking, and economics seem to have thoroughly surpassed all limitations... Despite all this, there is a region which, ever since the dawn of human civilization, has remained unsolved. A region that no kings or sages have ever been able to conquer. A region which sages gave up on trying to conquer and deemed accepting it to be unconquerable as correct. That is the region known as not dying. But humanity had proof before it that it exists at the cellular level. The mechanism is astoundingly simple. The equivalent exchange of cells. Even setting moral issues aside, unlike induced pluripotent stem cells and cloning, it's simple replacement. By my calculations, the cellular replacement of an entire body can be done in just two hours. Josuke, if the sages of this world witnessed you, what would they think about death...?”
- “...Here he comes... Everything in this world... All things under heaven and earth... And the connections between them...!! None of them will be on your side!! If you just 'move an inch' from that chair... An all-out attack of a power called Disaster will be coming for you!!”