One day, Zuo Ci, a university student living alone, meets Aina, a housewife, at a nearby izakaya. The two then meet again by chance, hit it off, and end up drinking at Zuo Ci's house until the morning... Although it is an unacceptable relationship between a student and a married woman, their relationship deepens. Then, after Zuo Ci gives her a spare key, Aina starts to go to Zuo Ci's house with a shopping bag in hand after her husband goes to work. They spend a passionate time together, trying to ease the loneliness of not being paid any attention by her husband...