Her husband remarried and left town for a business trip, leaving Nao alone at home with her stepson. One day, the son confides in her, claiming he's being bullied. Nao calls the two bullies over to reprimand them, but instead, they overpower and assault her. Despite resisting, her body involuntarily responds to their youthful vigor. In the midst of it all, her stepson suddenly appears—it was his revenge all along...