Ichika was introduced to her mother by her homeroom teacher, Riku. Ichika has had a steady stream of boyfriends, but she's always been in love with Riku. Ichika kisses a drunken Riku at her home. Riku is attracted to her boyfriend's daughter, and even though he thinks he shouldn't mess with her student, Ichi. And Iichika, who makes Riku her own, draws out Riku's true nature with her reverse anal torture and teaches him that she is the only one who can accept it.