Nao is asked by her pregnant sister to look after her brother-in-law, Yoshio, while she is hospitalized for tests. Then, by chance, she sees Yoshio walking with a strange woman... She becomes enraged at Yoshio for trying to commit adultery at her sister's difficult time. "Does any woman do you like?"Nao with contempt, and when she insults him, Yoshio becomes so aroused that he rapes her to keep her quiet. Nao feels so frustrated that she wants to kill him, and is made to cum over and over again...