Rinko Fujisaki, having married Masao for purely practical reasons, becomes instantly infatuated with his son, Kozuke. A woman who craves young men, she begins using every method at her disposal to make him hers. One day, while masturbating while fantasizing about Kozuke, she deliberately leaves her soaked panties in his room. From that moment on, her lewd advances escalate relentlessly, until she finally claims Kozuke's heart completely for herself.