Asako is a teacher, but behind the scenes she enjoys an immoral relationship with one of her students. If she acts with the utmost caution, she'll be fine. Or so she thought, but recently her student has begun to approach her even inside the school, seeking more extreme excitement. If she is found out, she will lose both her teaching career and her marriage. She suddenly becomes scared, but her youthful desires are unstoppable. But she can't ask for help. Asako has no choice but to become immersed in an affair inside the school.