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Wife Rika finds lipstick marks on her husband's Y-shirt when he comes home late at night. Unable to suppress her anxiety, Rika picks up her husband's cell phone and learns of the existence of Reiko, who works at the same place as her husband. Determined, Rika heads to her husband's workplace and meets Reiko. However, Reiko was not surprised, and touched Rika's body as if she had been waiting. Rika can't resist being mixed with an aphrodisiac in the tea served. Reiko's real purpose, which she thought was her husband's affair partner, was Rika from the beginning.