During a parent-teacher conference, Rena is informed that her son may have to repeat the year. She tries to seduce her son's teacher so that he can graduate, but... As the conference ends and Rena is about to leave the classroom, she hears a voice calling out to her. "I wonder what Fukiishi would think if she found out that her mother was doing this with her teacher." The voice belongs to a group of notorious bad boys who were still in the classroom after school. This is where Rena's nightmarish days of humiliation begin...