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Nao is asked by her pregnant sister to take care of her brother-in-law, Yoshio, while she is hospitalized for tests. Then, by chance, he witnesses Yoshio walking with a strange woman... I was furious with Yoshio who tried to commit unfaithfulness when my sister was in trouble. "Is any woman okay?" Yoshio, who was so excited that he was abused by Nao, who gave her a look of contempt, silenced her. Feeling so frustrated that she wants to kill her, Nao is humiliated and made to cum over and over again...