Aiko grew up in an ordinary household and attended an all-girls school from high school through university. She had no friends who invited her out to party and no romantic experience. One day, she received a sudden confession from an older man in her neighborhood, and agreeing to it, she decided to get married. Afterward, she settled into a peaceful family life, but as time passed, she gradually began craving the excitement of romance. At a drinking party, she reunited with old friends for a group date, where she met an older man who persistently pursued her. What began as a brief, hesitant yes from Aiko led to an unexpected turn of events.