Nanako, a friend of his mother's, comes to help his mother run a beauty salon at home. Her beauty has only grown stronger with age, and her son, Seigo, cannot help but have passionate feelings for her... That night, Seigo is Kokoro by her defenseless lewdness when she gets drunk and aggressive, and he ends up having sex with her. The next morning, Seigo is unable to resist the sight of Nanako, who looks exactly the same, and approaches her. Nanako writhes in agony from the young man's intense caresses, but this secret cannot last forever...