Nao is asked by her pregnant sister to take care of her brother-in-law Yoshio while she is hospitalized for a checkup. Then by chance, he witnessed Yoshio with a strange woman...

I was very angry with Yoshio, who tried to betray me when my sister was in trouble. “Are there any women?” Yoshio, who was so excited that he was tormented by Nao, who gave her a contemptuous look, silencing her.

So upset that he wanted to kill her, Nao was humiliated and captured ejaculating over and over again...