Reiko Shimura, who married into the Shimura family, has enjoyed financial stability and a comfortable lifestyle since her wedding. However, the presence of her husband's brothers unsettles her. In particular, the second and third sons secretly approach Reiko, taking advantage of their older brother's absence and repeatedly ravaging her lush, soft body. Reiko cries out "Stop," but contrary to her words, she grows increasingly wet and aroused. Their illicit sex is eventually discovered by her husband, leading to a dramatic confrontation.