After being caught in her stepson Yoshi's room, Chisato incurs his anger and is forcibly overpowered. She is tormented, photographed, and shown the images by Yoshi while her husband is away, forcing her to obey his commands. During her husband's business trip, Yoshi spirals out of control—making her greet his friends in humiliating outfits, subjecting her to endless abuse, and trapping her in a situation where resistance is impossible. Gradually, Chisato is depicted succumbing to waves of pleasure against her will.