Nao was asked by her pregnant sister to take care of her brother-in-law Yoshio while she was hospitalized for a checkup. Then, by chance, he witnessed Yoshio with a strange woman... I was furious with Yoshio, who tried to betray my sister when she was in trouble. "Is there any woman?" Yoshio, who was so excited that she was tormented by Nao, who gave her a contemptuous look, making her silent. Frustrated to the point of wanting to kill her, Nao was humiliated and forced to ejaculate over and over again...