!!PLEASW DONT BE FOOLED BY RATING!!
Its actually a really deep manga, tells a story about 2 guys overcoming the trauma of being raped differently. One got depressed, thunking theres no way society would acccept him and went on as a seggs worker for his rapist(?), while the other tried to overcome it. Kai was being a piece of shit to kiritani cause he wanted someone to relate to "giving him the same hell i went trough" or something. Why did kai recognize kiritani? He was the black haired student. This is just what i think btw.
Koi Kogare Utae