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Yumi, a married woman who lives with her husband Akira in Tokyo. One day, while living a peaceful life, Akira's younger sister Yuna jumped out of the house and moved to the Kazama family. In such a life, Yumi, who is jealous of Akira and Yuna's extraordinary intimacy, hits Yuna hard. The relationship between Akira and Yumi who knew it got cold, and on the contrary, it became a forbidden relationship with Yuna.