A friend of Yugi Mutou who is obsessed with American superhero comics, particularly Zombire. He and his parents all look alike and share Zombire obsession.
Hanasaki spent some time in the hospital. When his father came to visit, he gave Tomoya a Zombire figure, telling him that this is Zombire and he is the strongest hero in America. Holding the figure, Hanasaki said he felt stronger too. His father was delighted to hear this and promised to bring him more Zombire toys and figures every time he came home from America. This continued until Hanasaki acquired a vast collection of Zombire merchandise over the years.
Hanasaki was bullied by Souzouji into selling tickets to his concert, Souzouji's All Night Solo Live Show. Hanasaki was unable to sell any as Souzouji was a poor singer. he tried asking Yugi to buy one, but found Yugi had also been asking to sell them. rather than have both of them burdened, Yugi took Hanasaki's tickets, saying he would try to sell them all himself. Souzouji saw the exchange and beat up Hanasaki afterwards. Yugi arrived at the concert, not selling any tickets. Souzouji then showed him Hanasaki, beaten up and blamed it on Yugi for taking his tickets. Yugi apologized, but Hanasaki said he did not need to and that getting beaten up was his divine punishment for trying to sell Yugi the ticket earlier. Dark Yugi then emerged to punish Souzouji for what he did to Yugi and Hanasaki by defeating him in the silence game.
As class B came up with with ideas for their attraction at the school festival, Hanasaki suggested that they have a comedy manga dojo (gag manga in the English version). The rest of the class all looked at him funnily and he hung his head in emberrassment.
Hanasaki watched Yugi and Jounouchi dueling at school when they first started playing Duel Monsters.
After showing Yugi, Jounouchi, Anzu and Honda a Zombire comic in school, he invited them over to his house to show them his Zombire collection. During the visit, Hanasaki's father returned home and gave Tomoya a Zombire costume.
After his friends left, Hanasaki put on the costume and went outside. His father spotted him and payed some delinquents to fake a crime scene and allow Hanasaki to break it up. Two of the delinquents pretended to be beating up the third in front of Hanasaki. Hanasaki initially considered staying out of it, but throught Zombire would not do such a thing. He approached the attackers and demanded that they leave the victim alone. The two proceed to attack Hanasaki in turn. He flinched each time, but found the two guys fell back as if they had taken a powerful blow each time. The two delinquents ran away and Hanasaki called after them, saying that he was Zombire. The next day at school, Hanasaki saw two of the delinquents questioning Yugi. He ordered them to leave Yugi alone, although not wearing his costume. The delinquents shrugged and decided to leave. Later Hanasaki recieved a message from the delinquents saying that they had kidnapped Yugi, so Hanasaki put on his costume put on his costume and confronted them. However this time, the delinquents demanded more money than Hansaki's father could afford, so the delinquents proceeded to attack Hanasaki and told him they had been paid last time. However Dark Yugi showed up and saved Hanasaki. As Dark Yugi escorted Hanasaki away, he told him that he can still be a hero.
After Sugoroku Mutou was hospitalized during Death-T, Hanasaki visited him at the hospital. Jonouchi called Hanasaki at one point to see that Sugoroku was okay.
In Yu-Gi-Oh! GX, Hanasaki is one of Trueman's victims, with his name appearing on a list of names. Each name dissappeared after Trueman sent them to the World of Darkness.
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