One day, Arita, who lives alone, meets a married woman, Kana, at a local izakaya. After a falling out with her husband, she ends up drinking with him... This leads to the two of them becoming closer, and before they know it, they're having a physical relationship. Arita gives Kana a spare key to his house, and Kana starts heading to Arita's house with a shopping bag in hand when her husband goes to work. To ease the loneliness of their misunderstanding, they start spending intimate time together in the younger man's room...