One day, Arita, who lives alone, meets a married woman, Shiori, at a local izakaya. She ends up drinking with him, as she is at a loss after a falling out with her husband... This leads to them becoming close, and before they know it, they are having a physical relationship. Arita gives Shiori a spare key to his house, and Shiori begins to head to Arita's house with a shopping bag in hand after her husband goes to work. Then, as if to ease the loneliness of their misunderstanding, they begin spending intimate time together in the younger man's room...