Nao was asked by her pregnant sister to take care of her brother-in-law Yoshio while she was in the hospital for a check-up. Then, by chance, he witnessed the scene of Yoshio walking with a strange woman... I was very angry with Yoshio, who tried to betray me when my sister got into trouble. "Is there a woman?" Yoshio, who was so excited that he was tortured by Nao, who threw her a contemptuous look, silenced her. Frustrated to the point of wanting to kill her, Nao was humiliated and forced to ejaculate over and over again...