Mari, the stepmother, struggles with her relationship with Yoshio, her husband's rebellious stepson. One day, a chance incident leads to Yoshio scolding her harshly and forcefully taking her against her will. This experience becomes a turning point, drawing Mari emotionally closer to Yoshio. While her husband is away on a business trip, Mari is surrounded by Yoshio and his friends, who repeatedly dominate and ravish her intensely. Despite being overwhelmed, her body trembles and her heart grows passionate. Again and again, she reaches climax, her emotions spiraling into confusion. Gradually, both her body and mind fall completely under the control of these young men.