Three months have passed since Miki, who lost her husband, began living with her daughter and son-in-law. Her son-in-law, who often comes home late from work, is frustrated by his wife's cold treatment. One night, a drunken son-in-law mistakes Miki for his wife and makes advances. He realizes his mistake and apologizes to Miki. Miki, seeing his frustration, comforts him with her hand. Things escalate from there, and they end up having sex. Since then, Miki, despite her guilt, has been swept away by her son-in-law's advances, and...