Reiko Sawamura's ordinary life with her husband begins to unravel when she starts living with her father-in-law. Captivated by Reiko's allure, the father-in-law offers financial support for a new house on the condition that she expose herself to him. Reluctantly, Reiko agrees. But when he suddenly appears and assaults her, the situation spirals out of control. Enlisting a friend to record everything, he takes complete advantage of her, his lust growing more uncontrollable with each passing moment. As the humiliation escalates, the story builds toward an inevitable and shocking conclusion.