A married woman who received a backup key, and her solitary room where she had sex with a male student until graduation. (Kana Mito JUQ-256)

One day, Nakano, a job-seeking single man, meets Kana, a professional housewife, at a nearby izakaya (Japanese pub) and falls in love at first sight. They later meet again by chance, exchange contact information, and drink together at Nakano's house. Their relationship deepens over time. Nakano gives Kana his keys, and while her husband is at work, Kana comes to Nakano's house with shopping bags. To combat their loneliness, they spend a lot of time together, but their relationship changes after Nakano finds a job…