It's been three years since Hana remarried her current husband. She noticed that her stepson Yoshikazu had been acting strangely recently. One day, a decisive event occurred. She saw Yoshikazu masturbating while smelling her panties. Enraged, Yoshikazu immediately pushes Hana down and tries to force a relationship. Hana refuses and takes her son's penis into her mouth instead... From that day on, her stepson's relentless forced humiliation began.