When the company where Yamagishi works goes bankrupt, the couple move into the home of her father-in-law, Mineo. Mineo welcomes them with open arms, but... Even in his old age, Mineo still has an insatiable sexual desire, and he fears that Itsuka he will suddenly attack Kotone. But if that's the case, he decides to "act instead of worry!" and begins to plan his way to make her his own... Kotone falls for the schemes of the seemingly good-natured Mineo, and is raped. Her father-in-law's insatiable carnal desires are not going to end with just one time...