Mika, the stepmother, has no sexual relationship with her husband and carries loneliness, yet endures daily molestation by her stepson Yoshio. From daytime onward, Yoshio torments her body, gradually consuming her mind with pleasure. One day, Yoshio's friends visit and demand her body. Initially refusing out of shame, Mika slowly awakens to desire, exposing herself completely. The lewd spectacle igniting Mika's body now leads inevitably down an inescapable path.