Koichi Hirose ★ Histoire
Une biographie détaillée de Koichi Hirose.
Passé
Koichi Hirose est un habitant de Morio qui a vécu une vie normale toute son enfance. Il est né à l'hôpital de la Croix Rouge à la cité de S le 28 mars 1984 à 6 heure 27 du matin. Il est né de manière prématuré, et ne pesait que 2325 g à la naissance. Ainsi, il a aussi passé 7 jours en soins intensifs.
Koichi vécut une enfance ordinaire auprès de ses parents, de sa grande soeur Ayana Hirose et de son chien Police.
Diamond is Unbreakable (1999)
Koichi rencontre les Joestars
En avril de 1999, c'est la rentrée des classes au Japon. Koichi est alors en première année au lycée Budugaoka à Morioh, assigné à la classe 1-B. Alors qu'il se rend au lycée, Koichi traverse la place de la gare et rentre par accident dans Jotaro Kujo. L'impact lui fait lâcher son cartable mais ses affaires sont instantanément rassemblés par Star Platinum. Koichi n'ayant pas de pouvoir Stand, ce dernier ne comprend pas ce qui est arrivé.
Jotaro demande à Koichi s'il ne connaitrait pas les "Higashikata" et leur adresse. Un groupe de voyous du lycée de Koichi survient et intimidide Koichi, lui ordonnant de les saluer en tant que cadet. Koichi s'exécute, effrayé. Koichi et Jotaro observent les même voyou essayer de s'en prendre à un autre lycéen, met ce dernier finit par s'énerver et les effraie avec un pouvoir Stand. Il s'agit de Josuke Higashikata, le garçon que Jotaro recherche. Koichi assiste à la bizarre rencontre entre Jotaro et Josuke, Jotaro révélant leur lien de parenté et le fait que le père biologique de Josuke est Joseph Joestar, ainsi que la tendance de Josuke à s'énerver dès qu'on se moque de son pompadour. Koichi entend parler d'un certain Anjuro Katagiri qui rôde en ville et aurait un pouvoir Stand. Après cette rencontre mouvementée, Koichi et Josuke font connaissance et passent leur journée ensemble.
En rentrant du lycée, Koichi et Josuke assistent à une prise d'orage devant une supérette. Lorsque le preneur d'otage insulte la coiffure de Josuke, ce dernier s'énerve et neutralise le brigand. C'est alors que Josuke découvre que le preneur d'otage était contrôlé par un Stand, Aqua Necklace qui n'est d'autre que le Stand d'Anjuro.
Josuke et Jotaro finissent par neutraliser Anjuro, mais ce dernier aura assassiné le grand-père de Josuke.
Les frères Nijimura
Après que Josuke a emprisonné Angelo à un rocher, l'affaire n'est pas encore close car quelqu'un de Morio lui a donné son pouvoir. Un jour, en rentrant du lycée, Josuke et Koichi passent devant une maison abandonnée. Ayant vu quelqu'un rôder dans l'ombre à l'intérieur de la maison, Koichi passe sa tête dans le portail pour mieux voir qui c'était. C'est alors qu'un autre garçon à l'air hostile surprend Koichi et referme violemment la porte au cou de Koichi. En plus, un second assaillant tire sur Koichi avec une Flèche. Ce sont les Frères Okuyasu et Keicho Nijimura qui tirent sur les gens avec leur flèche qui donne des pouvoirs Stands. Koichi perd conscience. Josuke veut aller le soigner, mais Okuyasu s'interpose avec son Stand The Hand. Alors qu'Okuyasu se bat contre Josuke, Keicho traîne Koichi à l'intérieur. Josuke essaie de le rattraper une première fois mais il doit battre en retraite hors de la maison lorsque Keicho lui tend un piège avec son pouvoir.
Josuke parvient à vaincre Okuyasu, mais Koichi est toujours mourant à l'intérieur de la maison. Josuke retrouve Koichi au milieu d'une chambre à l'étage. Heureusement, Okuyasu est touché par la gentillesse et le courage de Josuke, et utilise The Hand pour effacer l'espace et téléporter Koichi vers Josuke, neutralisant sûrement un piège tendu par son frère. Okuyasu part alors. Josuke peut soigner Koichi mais ils sont attaqués par le Stand de Keicho : Bad Company. Bad Company est toute une compagnie de soldats, tanks et hélicoptères miniatures qui attaquent les héros. Le duo se retrouve bientôt acculé dans une salle par Bad Company. Durant leur combat, Koichi découvre qu'il peut voir les Stands maintenant et avertit Josuke d'une attaque. Lorsque les héros se retrouvent coincés, Keicho se montre car il est intéressé par le pouvoir de Koichi. Il envoie un béret vert attaquer Koichi, et ce dernier, poussé par le danger, invoque son Stand... qui se trouve être un oeuf géant. Keicho décide d'ignorer Koichi pour l'instant et attaque Josuke seulement pour en finir avec lui. Heureusement, Josuke trouve un moyen de vaincre Keicho.
Malgré sa peur, Koichi a le courage de pousser Josuke à fouiller plus profondément dans la maison pour retrouver la Flèche. Lorsque les héros atteignent le deuxième étage, ils entendent des bruits étranges. Koichi entrouve la porte du grenier et une main monstrueuse saisit Koichi par le poignet. Lorsque Josuke utilise son Crazy Diamond pour contreattaquer, il coupe la main, mais elle repousse du bras. Les héros découvrent alors le père Nijimura qui est un petit monstre enchainé dans le grenier. Keicho leur explique en larme que leur père était un des servants de DIO mais qu'à la mort de ce dernier, un bourgeon de chair implanté dans le cerveau de leur père est devenu hors de contrôle et a transformé leur père en monstre. Depuis, Keicho recherche un Stand qui pourrait euthanasier leur père. Josuke restaure une photo de la famille Nijimura, ce qui émeut le monstre. Malgré la preuve de l'humanité qui réside dans le monstre, Keicho refuse de céder la Flèche. C'est alors qu'un nouveau Stand apparait : c'est Red Hot Chili Pepper, un Stand électrique. Ce dernier tue Keicho puis vole la Flèche. Bouleversé car son frère l'a sauvé, Okuyasu rejoint les héros pour se venger de Red Hot Chili Pepper.
Tamami Kobayashi et Echoes ACT1
Un matin, Koichi part au lycée sur son nouveau vélo. Il adore le vélo mais sa joie est interrompu lorsqu'il roule sur un sac au beau milieu de la route et tombe. Il devient inquiet lorsqu'il entend un miaulement venant du sac et un liquide dégoulant au sol. Koichi croit alors avoir roulé sur un chat. Un étranger assis sur un banc près de la scène l'interpelle. Cet homme s'appelle Tamami Kobayashi et ce dernier prétend que c'est son chat que Koichi a tué. Tamami essaie d'intimider Koichi et utilise son pouvoir Stand : The Lock. Tamami fait alors apparaitre un gros verrou dans la poitrine de Koichi et ce dernier ressent une grande culpabilité. Koichi essaie de prétendre qu'il n'a pas d'argent mais The Lock gonfle et devient encore plus lourd. Tamami se saisit de son porte-monnaie et voit qu'il a 7000 yen. Heureusement, Josuke et Okuyasu les aperçoivent et viennent à sa rescousse. Cependant, Tamami ne se laisse pas intimider par Okuyasu, lequel le frappe mais se fait aussi piéger par The Lock. C'est alors que Josuke ouvre le sac et montre que le chat n'était qu'un jouet. De plus, il soigne Tamami et lui rend ses dents. Koichi et Okuyasu sont libérés de The Lock lorsque leur culpabilité disparait. Tamami, effrayé, part en courant. Malheureusement, ce dernier a volé les 7000 yen et n'a laisse qu'un coin pour duper les héros. Koichi revient plus tard chez lui, à 4:07 de l'après-midi. Il est choqué de voir Tamami en train de bavarder avec sa mère dans le salon, et donnant un massage aux épaules de cette dernière en plus.
Koichi demande ce que Tamami fait et ce dernier prétend qu'il est là pour rendre ses 7000 yen à Koichi. En effet, prétend Tamami, ils se seraient rentré dedans ce matin et échangé leurs porte-monnaies par erreur. Tamami prétend qu'il avait un demi-million de yen dans le sien. Pour prouver que Koichi doit avoir son portefeuille, il montre des reçus dans le portefeuille (qu'il a mis dedans exprès sans que Koichi ne s'en rende compte) et dépeint alors Koichi comme un voleur qui lui cache son demi-million. Avec ceci, la mère de Koichi devient victime de The Lock car elle commence à croire Tamami. Pire, la soeur de Koichi entre aussi et Koichi découvre avec effarement qu'elle est aussi tombée victime de Tamami. Ce dernier se réjouit de sa victoire, se voyant déjà prendre possession de la maison et abuser de la jeune fille mais Koichi se met en colère. Il pousse sa famille dehors et confronte Tamami avec son Stand Echoes ACT1, qui est sorti de son oeuf.
Echoes est faible physiquement et ses coups de font pas mal, mais par contre il peut créer des sons, et force Tamami à entendre toute une cacophonie de sons. Cependant, Tamami ne baisse pas les bras. Il sort un couteau d'un tiroir et se coupe exprès. Il geint bruyamment et lance le couteau dans les mains de Koichi, si bien que quand sa mère et sa soeur débarquent, elle croient que Koichi a voulu poignarder Tamami. Leur culpabilité en est démultipliée. Ayane, la soeur de Koichi, perd conscience, et sa mère menace de se tuer avec le couteau. Tamami fait pression sur Koichi pour qu'il capitule, mais ce dernier va installer la phrase "Crois en moi!" dans sa mère. Elle retrouve ses esprits en se rappelant qu'elle soit que Koichi est gentil de nature. Sa culpabilité disparait et elle est libérée de l'emprise de The Lock. Sidéré, Tamami s'avoue vaincu et supplie Koichi de l'épargner. Profitant de la situation, Koichi prend en confiance dit en blaguant à moitié à Tamami de lui donner le demi-million de yen.
Plus tard, Tamami devient le larbin de Koichi.
Toshikazu Hazamada (Surface)
Tamami va à la rencontre de Josuke et de Koichi au lycée pour leur parler d'un certain Toshikazu Hazamada. En effet, Hazamada semble être louche car il y a quelques semaines, il s'est disputé avec un camarade et ce dernier s'est crevé l'oeil sans explication. Donc, Hazamada pourrait être un manieur de Stand malveillant. Koichi et Josuke décident d'en apprendre plus et enquêtent sur Hazamada. Tamami admire Koichi pour son courage mais préfère partir.
Les héros essaient de regarder dans les salles de classes mais Hazamada est absent. Lorsque Josuke et Koichi ouvrent le casier de Hazamada, il y découvrent un mannequin en bois de taille humaine. Ce mannequin se transforme alors en Josuke. C'est Surface, le Stand de Hazamada. Les héros découvrent que Surface peut non seulement prendre l'apparence de quelqu'un mais aussi que si leurs regards se croisent, Surface peut forcer Josuke à suivre ses mouvements. Prenant garde à ne pas entrer dans la portée d'attaque de Crazy Diamond, Surface force Josuke à donner un violent coup de coude à Koichi, puis le force à prendre un stylo et à se crever l'oeil. Satisfait d'avoir "vaincu" les héros, Hazamada décide d'aller aussi assassiner Jotaro pour avoir la paix et pouvoir abuser de son pouvoir après. Heureusement, Koichi a dupé Hazamada et créé un son avec Echoes pour faire croire que Josuke s'est vraiment crevé l'oeil. Josuke soigne Koichi et ils peuvent partir à la poursuite de Hazamada. Ils essaient de prévenir Jotaro d'abord, mais malheureusement, Jotaro est déjà parti de l'hôtel quand Josuke l'appelle car Surface l'a appelé pour se voir. Ils doivent alors trouver Jotaro avant Hazamada.
Dans la rue, Josuke profite d'une distraction pour envoyer un bris de verre vers Hazamada. Surface attrape le verre, mais Josuke restaure alors la bouteille dont vient le bris de verre, ce qui coupe la main de Surface. Ils battent ensuite en retraite. Alors que Hazamada atteint un passage à niveau, Koichi créé le son d'une alarme pour faire croire qu'un train arrive. Hazamada prend un pont alors que Josuke et Koichi peuvent traverser l'intersection et atteindre la place de la gare pour prévenir Jotaro. Malgré une dernière tentative de Hazamada pour attaquer Jotaro, ce dernier se fait tabasser par des motards, et Josuke détruit Surface pour se défouler.
Yukako Yamagishi Falls in Love
Koichi is invited by a fellow student, Yukako Yamagishi, to drink in a café. Curious, Koichi asks what Yukako wants and she confesses her love to Koichi, shocking the boy. However, Koichi's joy at being proposed to is cut short when Koichi doesn't answer clearly to how much he reciprocates Yukako's love, which makes Yukako enter a brief state of rage before calming herself and leaving in shame. Abashed by Yukako's temper, Koichi sips his cola and realizes that it is full of hair.
The next day Yukako tries again to approach Koichi and goes overboard with her display of affection, thus Koichi uses his class representative as an excuse for fleeing. Later Yukako jealously plants some of her hair on the representative, which results in the girl gagged and blindfolded by hair as her own hair burns. Fortunately, Okuyasu uses The Hand to erase the fire and some of the representative's hair. Josuke and Okuyasu realize that Yukako is up to no good.
Later Koichi, Josuke, and Okuyasu meet to discuss what to do with Yukako. Stressed by Yukako, Koichi's English grades are dropping, and he wants to stop Yukako. Unwilling to incur her wrath, the trio eventually settles for indirectly discouraging Yukako from seducing Koichi by ruining his reputation. Josuke and Okuyasu proceed to loudly slander Koichi near Yukako, aware that she is listening. However the same night, Yukako kidnaps Koichi, wanting to work for his "betterment." Later, Koichi finds himself in a villa and unable to contact the outside world. He's realized that Yukako is a Stand user, but has the advantage of surprise, so decides to play along. While Yukako prepared a copious breakfast, she forces Koichi to attend an English quiz where a false answer results in being force-fed things such as soap or asparagus rolled in dictionary pages. Koichi interrupts the quizz and tries to flee, but Yukako effortlessly restrains him as she planted some of her hair on Koichi, and can lift him up to the ceiling. Yukako leaves, assuring that no one will come to the villa until summer and that they will have time to "make progress".
Koichi cannot open the lock to the bathroom, causing him to wet himself. Ashamed, he tries to dissuade Yukako from liking him but it fails as she still sees something shining within him and even says she is happy to do his laundry. She shows him the electric chair she is building for his dinner study time, causing him to worry about what will become of him.
She goes out to order olive oil and Koichi reasons there must be a pay phone nearby, which is luckily within 48 meters (Echoes has a range of 50). Unfortunately, he does not have a 10 yen coin to pay for the call to Josuke and reasons that if he calls the police Yukako would simply kill them. Yukako approaches Koichi and figures out he knows about the pay phone but warns him he cannot escape. As she goes to the pay phone to order, Koichi manages to use Echoes to make the calling noises of the phone (so long as the phone hears the sound of the button the call will go through) and manages to call Josuke as he and Okuyasu are trying to find his location.
Yukako approaches the house as Koichi barricades the door with a shoe cabinet and the electric chair from earlier while nailing them to the door. While Yukako is happy that the two have powers as it further deepens the bond between them, Koichi uses Echoes to produce the sound "I hate you" from all over her body. Yukako is so stubborn in her delusions that the sound has no effect. She tries to open the door but is shocked by the doorknob, which was rigged with the electric chair. Angry at this act of defiance, Yukako manipulates the hair she implanted in Koichi's scalp to thrust him against the door to open it. She uses her Stand to surround the house in hair and prepares to attack. However, due to the stress Koichi's Stand "dies". Koichi mourns for Echoes, as he believes he pushed his Stand too hard and killed it, but Yukako manages to see that the Stand is not dying but was evolving and worried, moves the shoe cabinet away from the door and angrily asks Koichi what is happening to his Stand.
Koichi then realizes that his Stand is not dying but has evolved into Echoes ACT2 and Yukako is suddenly blown away from the door. Koichi notices sound effects on the door and realizes he was hoping for her to be blown away and since the door has the words blown away on it she flew. Yukako proclaims Koichi is hers approaches the house once more and sees that Koichi has cut off his hair in order to remove the hair she implanted in his scalp. He warns her not to come closer and that she can't beat him, causing her to become enraged as she believes he is getting too cocky and that he belongs to her and shouldn't defy her. She comes to the house but burns her hand on the stair rail as Koichi implanted the word sizzle on it, causing the rail to feel hot.
Yukako becomes even more enraged and threatens to kill Koichi if he does not say "I love you" to her. He refuses and once more pronounces his hatred of her. She uses her hair Stand to grab onto Koichi, only to realize he implanted words on himself, causing Yukako to once more fly away. The stress of the battle causes her hair to turn white and Koichi approaches her to make sure she is alive. While he is relieved she didn't die, Yukako awakens and captures Koichi's Stand, threatening to tear it apart since she can't touch Koichi herself, slicing part of Echoes' tail and throwing it in the ocean. However, Koichi warns her the ground is unstable as Echoes not only heard Yukako's heartbeat as he approached her to ensure she was alive but also heard the ground giving out.
Yukako and Echoes fall and as she is about to be pierced by a rock, Yukako is bounced safely to the surface. She realizes that as she was trying to kill him that Koichi had already come up with a plan to ensure she would be saved and implanted the "Boing" sound when she tore off part of Echoes tail and threw it near the rock. Koichi mentions how she didn't listen to him and leaves while Yukako realizes she lost from the beginning and is even happier than before as she loves him more than ever and doesn't care if he doesn't notice her as she is happy just thinking of him. Josuke and Okuyasu catch up to him after his fight and ensure he is okay. They also notice Yukako with her white hair and that she is smiling while looking in their direction causing them to panic and try to leave. Meanwhile, some fishermen who saw Yukako fall and bounce right back up name the area Boing-Boing Cape, with a rumor going around that a girl who tried to commit suicide was bounced right back up and became a popular fisherman spot. Some time later, Koichi is given another English test, having this time scored a perfect grade, yet he is unsure about how to feel about this.
Red Hot Chili Pepper
Akira Otoishi révèle qu'il surveillait Koichi et les autres héros manieurs de Stand grâce à Red Hot Chili Pepper qui peut voyager dans les câbles électriques. Koichi, Josuke et Okuyasu sont convoqués par Jotaro et ils se rencontrent sur un terrain vague pour discuter de quoi faire à propos de Red Hot Chili Pepper. Jotaro leur dit que Joseph Joestar va arriver à Morio pour aider à traquer le manieur de Stand. Malheureusement, Red Hot Chili Pepper était caché dans la batterie de la moto d'Okuyasu et a tout entendu. Malgré les effort d'Okuyasu, Red Hot Chili Pepper parvient à s'enfuir.
Les héros vont au port pour aller à la rencontre de Joseph. Josuke et Koichi restent alors au port pour garder l'endroit tandis que Jotaro et Okuyasu prennent un bateau pour rejoindre Joseph en mer. Koichi est témoin du combat entre Akira Otoishi et Josuke. Josuke gagne le combat. Plus tard alors que le bateau de Joseph arrive au port, Otoishi parvient à se glisser dans le navire et parvient presque à assassiner Joseph mais Okuyasu parvient à l'arrêter. Quand Joseph descend du navire, il trébuche car sa canne s'est cassée. Josuke le rattrape. Okuyasu propose que Josuke répare la canne avec Crazy Diamond mais Koichi le fait taire, étant ému de voir Josuke et son père marcher main dans la main.
Koichi & Rohan Kishibe
Koichi meets Hazamada in the streets of Morioh. Despite an awkward conversation as former enemies, Hazamada and Koichi quickly bond over their love of manga. Hazamada then points out that the famed manga artist Rohan Kishibe has recently moved in the town, and the two head to his house in the hopes of meeting him. As Koichi tries to ring the bell, Rohan grabs his arm from behind the door, scaring the boy a little. However, the mangake is happy to learn they are fans and gives them a tour of his studio.
In his office, Koichi and Hazamada are impressed that Rohan is talented enough to draw his manga alone but are creeped out by how far Rohan goes to perfect his manga as he tastes a spider right in front of them. Rohan leaves and Koichi and Hazamada can't resist the chance to sneak a peek at his new manuscript. 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 a book and read all of their secrets.
Koichi summons his Echoes but the attack misses as Rohan can also write commands on those he turns into books, thus he's prevented Koichi from attacking him as a precaution. Highly interested in Koichi's personality and colorful life, Rohan proceeds to take pages from Koichi. At the end, Rohan lets the two go home with no memory of what just happened. That night, Koichi senses something amiss when he discovers he's lost 20 kg, but suddenly forgets about it just as he prepares to inform Josuke. Under Heaven's Door's influence, Koichi goes back to Rohan's house the next day, visiting Rohan in his studio. Koichi then sees Rohan finishing drawing a page at astonishing speed, as Rohan was made enthusiastic by reading Koichi's files. Wanting to use every bit of Koichi's memories, the mangaka then rips off yet another page out of Koichi, making him remember that Rohan is a Stand user.
As Rohan plans to keep taking pages from Koichi to inspire his manga, the two hear a doorbell ring. It is Josuke and Okuyasu and Koichi slips away to ask for their help. Unfortunately, the safety lock written inside Koichi makes him unable to warn them and the duo seemingly leaves. However, after Koichi goes back up to Rohan's studio, Okuyasu barges in from a window, as the duo saw that something was wrong after seeing Koichi's untreated cut on his hand. Koichi is subsequently saved by Josuke, who beats up Rohan in an uncharacteristic rampage as Rohan insulted his hair style.
Rohan Kishibe's Adventure
A month later, Rohan, who has recovered from his injuries from Josuke, meets Koichi. The mangaka enlists him to find out about the strange alleyway that isn't on the map of Morioh.
They enter the strangely abandoned alley but they keep finding themselves on the same street with a mailbox. They are then approached by a girl named Reimi Sugimoto. Rohan immediately uses Heaven's Door against her. To his surprise, she turns out to be a regular girl as he keeps reading more about her character, while Koichi scolds Rohan for reading far too much of her personal information. After writing down a command for her to forget the ordeal, Reimi then interacts with the two, much to Rohan's displeasure.
Reimi narrates the story of a girl and her dog being assassinated and then reveals that both she and her dog Arnold are the ghosts of the story's victims. This also reveals that the Ghost Alley is a limbo between the World of the Living and Heaven. Reimi informs the others that the man who murdered her has been secretly killing others and asks them to stop him. After they agree, Reimi points them towards the exit, warning them not to turn around too soon as they will be pulled into the afterlife by dark spirits.
Rohan and Koichi feel and hear the malicious spirits behind them as they approach the exit. Losing his calm, Koichi tries to run to the exit and is told by Reimi's voice that it is safe to turn now. It is only the spirits tricking Koichi, and a myriad of hands come out of the darkness to grab Koichi and Echoes. Fortunately, Rohan manages to use Heaven's Door to get both him and Koichi to safety. Afterwards Koichi informs Josuke and Okuyasu about the murderer, but Josuke argues that there is no urgency to what seems a "mundane" crime involving no Stand user. Koichi is almost run over when he hastily crosses the street and apologizes to the driver, who is revealed to be Yoshikage Kira, the serial-killer in question.
Yukako Yamagishi Dreams of Cinderella
In the streets,Koichi meets Yukako, who has recently been beautified by Aya Tsuji and her Stand Cinderella. Koichi wishes to put aside their past fight and make peace, to Yukako's joy. Although Koichi and Yukako go as far as touching each other's hand, the time limit has passed. Koichi begins to have stomachaches and runs away. Koichi suddenly feels better, and noticing that he is holding Yukako's bag, runs back to give it to her. When he sees Yukako, Koichi's heart is enthralled by her beauty. Indeed, she has just revisited Aya Tsuji again to upgrade her treatment. However, Rohan appears and pressures him into following him. Yukako, who pictured both of them having an intimate moment, is taken aback. Finally, events conspire to make them hug each other and Joseph accidentally pushes Koichi in Yukako's arms; Yukako and Koichi share a passionate kiss.Several days later, Koichi informs Josuke and Okuyasu of his new relationship, which shocks them. However, he finds it strange that after their kiss, Yukako never contacted him again. In the streets, he sees a woman resembling Yukako, but the hideous woman denies being her. It is indeed Yukako, who crashes Aya's salon, ordering her to fix her face. However, Aya reveals that Yukako's face is gone forever and her features begin to progressively disappear as a result of tampering with Fate. Koichi suddenly enters the salon, having recognized Yukako by her personality alone. Impressed, Aya decides to give Yukako a second chance and spawns several faces, saying that she can choose whichever feels like hers, but choosing incorrectly would make her incredibly ugly forever.The truth is that had Aya lied, and that none of the faces belonged Yukako; only if she realizes this would Aya fix her face. Yukako is unable to decide, and asks Koichi to choose for her, saying that she will be satisfied with his choice, surprising Aya. Furthermore, when Koichi requests to be blinded in case Yukako ends up ugly to ease her pain, Aya is so moved by the couple's love for each other that she restores Yukako's features anyways. Everyone ends up happy.
Sheer Heart Attack
After Shigechi is killed by the murderer Yoshikage Kira,Josuke organizes a meeting consisting of himself, Okuyasu & his dad, Koichi, Jotaro, Joseph and Shizuka, Yukako, Hazamada, Tonio, Aya, and Rohan and brings them to meet Reimi. They are all informed about the killer and deduce that he must be a Stand user. The deduction prompts Jotaro to decide tracking down the culprit using his button which is the only clue Shigechi managed to give to Josuke before his death. While Josuke leaves, he briefly crosses paths with Kira.
Four days pass with no results before Koichi runs into Jotaro and accompanies him on his search for someone who may have repaired a jacket with similar buttons. The two find a shoe store that also specializes in tailoring. Jotaro admits that while he did check every tailor in Morioh, he did not consider a place like this, and goes in to try and find some leads. There, they learn that the store owner recognizes the button, pointing out the recently-repaired purple jacket that the button came from. However, the store owner decides to check the tag on the jacket to ensure that he's remembering the owner's name right, only to have his right hand suddenly blown off. As it turns out, Kira had been hiding in the back room and had deployed another bomb in the event that someone would use his lost button to track him down. Killer Queen's second bomb, a miniature tank-like object, rushes into the unconscious store owner's mouth before Kira grabs and shakes his jacket to bait Jotaro & Koichi within the bomb's range. Koichi runs up to try and take the coat back, but is pulled away by Jotaro as the bomb goes off.
Koichi notices that the killer is gone and rushes in to pursue. However, Jotaro interrupts him, explaining that the enemy wouldn't try to cut off loose ends, therefore they are still in danger. Despite Koichi's skepticism, Sheer Heart Attack shows up again and attacks Koichi. Star Platinum appears to defend Koichi and pummels the miniature tank, but the repeated punches barely dent it. While Jotaro fights Sheer Heart Attack, Koichi figures that such a powerful Stand means that the killer is nearby and defenseless, and proposes to send Echoes after him. Despite Jotaro's insistence that Koichi only defends himself with his Stand, Koichi sends him away to scout the area, only to be surprised that the enemy is already so far away from the store. Suddenly Sheer Heart Attack swifts his attack to Koichi again who is vulnerable. Thankfully, Jotaro stops time and starts a fire near him, having figured out that the enemy is heat-seeking. However, he cannot avoid the blast and is gravely wounded.
Koichi tries to wake Jotaro up while Sheer Heart Attack resumes his pursuit. When he drags Jotaro into the back of the store, Koichi sees the tank break all the lights along the way, allowing Koichi to discover the bomb's pattern. Now in the kitchen, Koichi sees that no immediate heat source is available, thus resorts to Echoes ACT2 to make a bait for the enemy out of a sizzling sound. During that short respite, he calls Josuke for help, but the stove he shut off earlier begins to heat anyway, making Sheer Heart Attack destroy it and explode. Koichi, who was near the center of the explosion, is propelled out of the store and wounded. At the last moment, Echoes evolves again into a new act, Echoes ACT3. ACT3 turns out to be not only more powerful than its previous iterations, but sentient as well. However, it is its power of making objects heavier which manages to neutralize Sheer Heart Attack, leaving the bomb trapped in the asphalt.
Koichi talks with Echoes ACT3 who explains that Sheer Heart Attack will only stay weighed down if it is within 5 meters of him. Koichi then sees Kira approaching him and deduces that he is the killer. Angry, he sends Echoes to punch Kira, but Killer Queen easily parries Echoes and sends it flying; Echoes lands outside of his 3-Freeze attack's range, releasing Sheer Heart Attack and Kira from its weight. Disconcerted at the sight of Kira seemingly having two Stands, Koichi is easily defeated when Killer Queen stomps Echoes on the floor. Kira, deducing that he has three minutes to kill Koichi, decides to pay him back his public humiliation with a severe beating. However, Koichi shatters Kira's confidence when he steals his wallet, learns all of his personal information from his driver's license, and exposes how easily Kira will be caught. Outraged, Kira makes Killer Queen punch through Koichi.
While Josuke and Okuyasu are still running, Kira tries to disintegrate Koichi but is distracted by Koichi's inside-out sock. After fixing it, he is interrupted by Jotaro, still heavily wounded, but whose Star Platinum is more than enough to pummel Kira and send him crashing into a garbage bin. Kira and Jotaro then both fall unconscious. When Josuke and Okuyasu arrive, Koichi is thankfully healed by Crazy Diamond.
Josuke and Okuyasu find Kira, who cuts his left hand and sics Sheer Heart Attack on them. Josuke, instead of fighting the sub-Stand, decides to repair Kira's hand so he can follow it back to its proprietor. The group eventually enters the Cinderella beauty salon where an injured Aya reveals that Kira forced her to switch his face with that of a random bystander. Aya explodes before revealing Kira's new identity, and the explosion, unfortunately, distracts the group, and they lose the hand within a crowd of commuters. Yoshikage Kira has escaped, having taken on someone else's face, clothes, and life.
Jotaro, Josuke, Koichi, and Okuyasu search Yoshikage Kira's old home looking for any noteworthy traits that they can use to track him down. A Polaroid camera suddenly snaps a picture of Jotaro and Josuke. They are attacked by the ghost Yoshihiro Kira, Yoshikage Kira's father. Yoshihiro traps Josuke and Jotaro in the photo, and also prevents Koichi and Okuyasu from entering the photographed space. Yoshihiro almost beheads the JoJos but Jotaro traps Yoshihiro alone in a photo before folding this new photo in two, taping it shut, and tacking it onto the wall.
The gang continues their search, but Yoshihiro manages to bluff Okuyasu into releasing him. Yoshihiro escapes, stealing the second Bow and Arrow from Josuke and fleeing successfully.
Highway Star
In an effort to hinder the heroes' investigations, Yoshihiro uses his Arrow to create as many Stand users as possible. One day, Koichi prepares to walk his dog Police, but he is suddenly called by Josuke who informs him of the Stand Highway Star. Koichi remembers a news story about a drunk driving accident in the tunnel where Highway Star first appeared; after some thinking, Josuke comes to the conclusion that this unknown biker must be the Stand user, and Highway Star is his means of speeding up his recovery. Josuke heads to the hospital where the user is at while continuing to evade Highway Star through various convoluted means.
Koichi reaches the hospital but is unable to find out anything about the biker because visiting hours are over. Desperate for information, Koichi sends out Echoes ACT3 to increase the mass of and tip over several expensive medicine bottles. The administrator ends up at Koichi's mercy and is forced to tell him that the man he is looking for is Yuya Fungami in Room 525, just in time for Josuke to come crashing in. Hearing this new information, Josuke rushes into the elevator, with Highway Star in hot pursuit. Since ACT3 is able to stop only one of the enemy Stand's feet at a time, it eventually catches up with Josuke and starts feeding off of him. However, Josuke still has enough strength to make it into the room and defeats Yuya.
Enigma Boy
One day, Koichi is attacked and turned into paper by Terunosuke Miyamoto. Josuke and Yuya look for him. Josuke is also imprisoned in paper but Yuya manages to free them from a shredder by letting himself get turned into paper. Koichi uses Echoes to weight Miyamoto's hands when he tries to take Yuya hostage and Josuke eventually turns the enemy into a book.
Cheap Trick
Rohan Kishibe becomes the unwilling host of Cheap Trick, and calls Koichi for help. When Koichi arrives at Rohan's house, the mangaka's claim of having an invisible Stand on his back that will kill him if he ever shows his back make no sense to Koichi and the boy thinks that Rohan is messing with him. Koichi leaves.
However, Koichi sees Rohan in the streets, still hiding his back. Knowing that the mangaka wouldn't be acting like this normally, he follows Rohan. When Rohan finds himself surrounded by hostile cats and dogs, Koichi comes to help repel the dogs. He applies Echoes' ability to Rohan's back but even this cannot help Rohan get rid of Cheap Trick. The mangaka seemingly shows his back to Koichi out of desperation but it is revealed that they are in Ghost Girl's Alley. When Cheap Trick turns back to attack Koichi, he is taken by the malicious spirits of the alley. Exiting the alley, Reimi, Rohan and Koichi notice Hayato Kawajiri's photo next to that of his father, Kosaku Kawajiri.
Crazy Diamond Is Unbreakable
Koichi, Jotaro, Josuke, Okuyasu and Rohan agree to meet the next day at 8:30 to find and interrogate Hayato. Unbeknownst to them, Kira has developed a new power, Bites the Dust. If anyone interrogates Hayato, Killer Queen enters their eyes and detonates their bodies before rewinding time to one hour before. Koichi is killed in this same in one of the loops.
After Josuke, Hayato and Okuyasu cooperate to battle Kira, Koichi finally finds Yoshikage Kira again and is fundamental to his defeat, as he multiplies the weight of Kira's left hand before he can activate his Bites the Dust ability. As Kira is accidentally killed by an ambulance, Koichi looks away in horror. After Kira's death, he then sees off Reimi as she, along with her dog, goes to heaven.
(The information below derives from the TV Anime. As such, it may or may not be considered canon.)
He is seen hanging out with Yukako next to the Angelo rock and wants to eat a lunch she made and holds her hand as they walk. He is later seen talking to Josuke and Okuyasu about a rumor the latter heard about Rohan being caught shoplifting at Kame Yu.
The Book: 4th Another Day
The information below derives from a Light Novel not written by Araki. As such, it may or may not be considered canon.
After the events of Diamond is Unbreakable, Koichi and Rohan find a cat (named Trinita) covered in blood and the two try to find his master. Koichi soon discovers that Hanae Orikasa, the cat's master, was killed under mysterious circumstances and tags along with Rohan to find the killer. After taking Trinita from the police station via Echoes, they discover, with the help of Heaven's Door, that the killer might be a Stand user, and has a very distinct characteristic: red marks on his arms.
Koichi later works with Yukako to discover if the killer is from the same class as them, using his Echoes ACT2. Learning the fact that there are multiple students in the school with this feature, Koichi tries figuring out the secret inside this. After Koichi knows about Josuke's mother Tomoko getting attacked, he meets up one of his schoolmates with red marks on his arms, asks him about this, and gets surprised with his response that he actually did this by himself. Then Rohan comes and uses Heaven's Door to read the schoolmate's memory. By reading his memory, Rohan deducts the Stand ability of the culprit and erases those made-up memories. After this investigation, Koichi asks Rohan to erase the memories from Tomoko as well.
Later, in March 2000, with Rohan's investigation, Koichi and his fellows have more information about Hanae Orikasa and the culprit. When Koichi and Yukako are studying at Thorn Parlour (Morioh public library), they encounter Chiho Futaba. Koichi is a little confused to know that Chiho knows his name.
On a snowy day, Koichi goes home by bus after school and runs into Josuke. They talk a little about the pompadour young man who saved Josuke's life when he was 4. Then Koichi glances a slide. They run to the spot and find an orphanage. After they ask the staff and the dean, Josuke and Koichi are quite sure that Takuma Hasumi is the culprit they are chasing. After getting Takuma's address, Koichi and Josuke decide to go to his home the next day.
That night, Koichi is informed by Yukako that Chiho's home is on fire, so he immediately calls Josuke, who doesn't reply and is actually on his way to Takuma's home. Josuke calls back when he fails to find Takuma in his home, then Koichi tells Josuke that Takuma might be at Thorn Palace now. Finishing the phone call, Koichi starts walking to Thorn Palour. Koichi also calls Okuyasu and tells him to go to Thorn Parlour on his way. It's assumed that the battle between Josuke and Takuma is already over when Koichi eventually arrives Thorn Palour, and Koichi calls the ambulance and police anonymously.
In August 2000, Koichi comes across Chiho accidentally, who is now living with her mom outside Morioh. After some chatting, he is astonished to find out Chiho is pregnant with Takuma, her half brother's child. Deciding to keep this encounter as a secret, Koichi prays that Chiho and her child will have a good future when Chiho is leaving Morioh.
Rohan au Louvre
Koichi makes a brief appearance, hearing Rohan's story about Nanase Kishibe along with Okuyasu and Josuke. Koichi questions Okuyasu about his opinion on Rohan's likeness with Mona Lisa, as they have different genders.
Vento Aureo (2001)
Gold Experience
In 2001, Jotaro request Koichi to go to Italy and find a a certain "Haruno Shiobana" and take a skin sample of him. Noting a passing resemblance with Jotaro, Koichi is convinced when Jotaro tells him that the trip's spending will be taken care of by the Speedwagon Foundation.
Koichi Hirose arrives in Naples Airport, gets acquainted with the usual taxi fees to Naples, and prepares to take a taxi to his hotel. Exiting the airport, he coincidentally meets Giorno Giovanna, who proposes to ride him to his destination for an unusually small fee. Very suspicious but desperate to avoid the long queue, Koichi reluctantly accepts Giorno's proposition. Indeed, as soon as Koichi puts his luggage inside the car, Giorno tries to take off without the Japanese teen. While Koichi easily stops the car thanks to his Stand, Echoes ACT3, Giorno calmly flees with a smile on his face. Koichi then sees that his luggage has somehow disappeared, with a small frog appearing where it should have been before promptly leaping into a sewer grate. Hearing two guards chatting about Giorno, Koichi decides to ask them for further information.
Koichi overhears the nearby policemen talking about Giorno's failure and realizes that "Giorno Giovanna" is actually the "Haruno Shiobana" he'd been sent to find. He doesn't, however, figure out that the frog he found in the back of the car is actually his luggage.
Koichi walks the streets looking for Giorno, upset about his misfortune. By pure chance, he sees him at a café and furiously asks the boy for his passport and luggage. Giorno tries to run away, but Echoes multiplies Giorno's hand's weight. Cornered, Giorno is forced to summon his Gold Experience and creates a tree to lift him up to a roof. Koichi tries to break the tree, only for his attack to be reflected and knock him down. Before leaving, Giorno openly observes that Koichi has a merciful nature. Jotaro Kujo receives a call from Koichi, who nervously narrates his encounter with Haruno, revealed to be Giorno. Explaining everything he knows, Koichi is then told that Giorno is in fact the son of DIO and that Jotaro wanted someone reliable to stealthily investigate the boy.
Joining the Gang
Sometime later, when Giorno is undergoing the test to join Passione, Koichi locates his apartment and searches for his passport. He nearly extinguishes the lighter flame which Giorno had stood in a loaf of bread, but Giorno whisks it away with Gold Experience just in time. Having successfully found his passport, Koichi looks through the window and sees Giorno with the dead janitor. Unaware of the situation, he barges out of the dormitory but attracts Black Sabbath who attacks him with the Arrow. Giorno nonetheless saves him by turning the handrails into flowers and forcing Black Sabbath to flee.
During this reprieve, Giorno explains to Koichi that despite everything he is righteous at heart. Somewhat calmed, Koichi explains the use of the Arrow and that Black Sabbath must be an automatic Stand following preset instructions. Black Sabbath eventually outmaneuvers the two by using birds to move between shadows and grabs Giorno from the shadow of a nearby tree. However, Echoes then shatters tiles and Gold Experience overcharges the roots of the tree with life, making it wither and exposing Black Sabbath to the light. Now considerably weakened, Black Sabbath is pummeled into disappearing for good. Afterward, Koichi rushes to call Jotaro Kujo for help against the Arrow, but Giorno stops him. As Polpo is probably unaware of the battle, Giorno sees an opportunity to continue infiltrating the gang. Revealing his dream to Koichi, Giorno convinces him of his righteousness and to keep his secret. Later, Koichi says he will report to Jotaro and leave for good.
In the anime, Giorno trusts him enough to tell him everything. Koichi continues his trip and he gives the report to Jotaro when he gets home. It's implied Koichi stood up for him since Jotaro doesn't pursue Giorno anymore.
