His father, Samonjiro, was introduced to his son's wife, Yuriko, and since he met Yuriko, he had been obsessed with masturbation without seeing Yuriko. However, after feeling the limit of delusion, Samonjiro visited his son's house and approached Yuriko. Yuriko resists such an act of Samonjiro, hits her head with a beating and faints. Then, Samonjiro nakeded Hyakuriko and inserted her cock. Then she woke up to the sudden pleasure and noticed that she was having sex with Samonjiro there.