The main protagonist of the story. He is a 15-year-old boy who all of his life has loved only women’s body parts. Because of his fetish, he is not attracted to women that do not have his ideal parts and does not get excited over parts that he believes not to be ideal. For this reason, he begs his mother to let him go to Sakashitamon Academy in Tokyo in order for him to seek out his ideal parts. Once he meets a woman who has one of his ideal parts, he becomes very protective of her. He goes though great lengths to indulge in his fetishes as well as maintain the friendship with the women themselves. Normally he is very passive and non-violent, but when a serious event threatens his ideal parts, he transforms into a berserker state. In this state, he is able to accomplish superhuman feats. Later in the story, he reveals that his father died when he was young and had a similar personality. His father's happiness of finding his wife (his ideal woman) is what drives Hachibe's quest for his own ideal woman.
A student at Sakashitamon Academy and the school idol. She is the daughter of the plutocrat Yatsuhashi, which strive to be the best at everything. Her father donates so much to the school that she can have her way without question from the teachers. She wants Hachibe to become her boyfriend because he is considered to be the strongest in the school. Much to her surprise, Hachibe rejects her because he can't see any ideal parts.
In early chapters he is seen as the boy from cram school that Tenmaku fell in-love with when the girls were out casting her, yet out of the blue tried to rape her; being the reason Tenmaku had a man-hating personality in earlier chapters. He reappears in the end of Chapter 70 where Tenmaku runs for her life in chapter 71, screaming rape till he saves her from being hit by a car. After she has calm down he tells her how he never meant to hurt her and only realized what he did after she slapped him. He tried to apologize to her but Tenmaku's father would threaten to cook him alive if he ever came near and didn't know she was still in the area when she changed school. He also reveals that he has yet had a girlfriend since he still loves her, where he asked if she was dating anyone yet she replied with how much he is a jerk for leaving her alone at the amusement park (but also states that it might be her fault for making him ride rides that were clearly making him sick). He states to her he isn't going to give up on her and leaves. Later in Chapter 73 looking for her school (and revealing he has a very terrible sense of direction, unable to locate it when it was right next to him).
