Married woman Toshi'e (39 years old). Suffering from her husband's indifference, she plans a one-night, two-day trip with a man she just met. Fifteen years into marriage, she juggles part-time work and housework while growing utterly exhausted by her husband's attitude. Her husband is a five-years-older former coworker; they started dating during a company retreat, married two years later after getting pregnant, and initially he was dependable and easy to talk to. However, after becoming a son-in-law in a matriarchal household, he gradually turned into a selfish, self-centered man. He no longer listens to his wife or shows any interest in her. With their children soon entering middle and high school, the couple is about to enter a phase of living alone together. Desperate to rekindle her husband's interest, she offers her body to another man for the first time, leading to overwhelming ecstasy. A journey to rebuild her marriage—this is the path she chooses.