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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 are physically intimate. 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...