I really like the characters! Pure-hearted and virginal, but playboy looking student and the upstanding acting but actually sadistic tease student become unexpected stepbrothers. They can't let anyone know though, because their "fans" would freak out. However, the sadistic student starts making the moves on the playboy student and the playboy is confused that he doesn't hate it.
Charao-kun to Haraguro-kun no Himitsu