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One day, Yutaro, who lives alone, meets a married woman, Ai, at a nearby pub. He ends up having a drink with his girlfriend who is at a loss after having a rift with her husband, but... After that, he became friends with her, and before he knew it, they began to have a physical relationship. Yutaro gave Ai a duplicate key to his home, and Ai started heading to Yutaro's house with a shopping bag in hand when her husband left for work. Then, as if to relieve the loneliness of being a married couple, she begins to spend a lot of time in his younger boyfriend's room...