After the husband was laid off, the Yamashiro couple decided to move back to their parents' home where the father-in-law lives alone in order to save money. Mizuho, ​​the wife, feels uneasy spending time with her father-in-law and tries to relieve the tension by masturbating, but... she is caught by her father-in-law who has returned home. The father-in-law, who was originally a womanizer, takes this opportunity to set his sights on his daughter-in-law's fresh body and play with it. Unable to talk to her husband about it, Mizuho does as she is told and is raped. However, her father-in-law exposes her to even more humiliation and makes her his tormenter.