Her father-in-law, Kozo, came to Tokyo to meet his sister-in-law's first grandchild. His wife, Maho, hopes that Itsuka her family will join them. But her husband is not so keen. Watching from the shadows, Kozo takes pity on Maho, who is trying to console herself with her sexual frustration, and the moment they are alone... Unable to withstand the persistent and rough caresses and penetration that her husband does not have, Maho is violated in the midst of a climax. The sadness and pleasure of being violated by Kozo swirls violently in her heart, but she is swept away by her father-in-law who comes to her every day...