Megumi Ichijou plays a mother who, despite being a female school doctor, is a lustful and erotic woman. She becomes aroused upon finding pornographic magazines in her stepson's room, leading her to masturbate while secretly watching him have sex with his girlfriend. Her desires intensify after being taken by a male colleague in the infirmary, escalating her forbidden lust. The story unfolds as she develops a taboo relationship with her stepson.