Miki, who lost her husband, has been living with her daughter and son-in-law for three months. Her son-in-law, who comes home late from work, has been growing increasingly frustrated due to his wife's cold treatment. One night, the drunken son-in-law mistakes Miki for his wife and makes a move on her. When he realizes his mistake and apologizes, Miki says, "If you're pent up," and begins to comfort him with her hand. From there, the situation escalates, and they end up having sex. After that, Miki, burdened with guilt, gives in to her son-in-law's advances and continues a secret affair behind her daughter's back. Thinking, "It's really good that we're living together," with mixed feelings, Miki persists in this forbidden relationship.