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His brother-in-law, Atsushi, and his wife, Naomi, decided to move suddenly and stayed at the Shiraki family for a while. - At first, his wife, Yuko, was willing to welcome her, but she began to spend a frustrating time with her younger brother and his wife's friendship and sexlessness. - Gradually her frustration grows, and Yuko can't stand it and attacks Atsushi's sleep. - Suddenly, she is surprised, but she can't resist her fascination and she is swept away by her desires. - From that day on, Atsushi was forced to make Yuko's endless carnal divergence partner ...