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