Ichika’s mother introduces her new boyfriend to her homeroom teacher, Riku. Ichika has had boyfriends, but the truth is that she has always been in love with Riku. Ichika kisses a drunken Riku at home. Riku is attracted to Ichika even though he knows he shouldn’t touch her, the daughter of his boyfriend and his student. Ichika wants to make Riku her own, so she uses reverse anal torture to bring out Riku’s true nature and teach him that he is the only one who can accept it.