Shiho's daughter and son-in-law have been married for a year. The son-in-law is constantly dominated by his younger wife. Today, he's visiting Shiho's house for a homecoming. That night, Shiho is caught masturbating by her son-in-law. The next day, as Shiho cleans while reading a book, her son-in-law can't help but grab her from behind. Shiho tries to resist, but the son-in-law's strength overpowers her, and she's violated. Shiho and her son-in-law keep this a secret from their daughter. This becomes the catalyst for them to seek each other's bodies...
