Mizuki lives a carefree married life with her kind and gentle husband. However, Mizuki has one complaint. She lives with her vulgar father-in-law. She is fed up with living with her father-in-law, who sexually harasses her on a daily basis. One day, her father-in-law finds Mizuki asleep while her husband is away. Taking advantage of his son's absence, he pushes her underwear aside and devours her genitals, which smell of female and sweat, before forcibly cumming inside her. From then on, Mizuki's young body continues to be defiled by her father-in-law's beast-like sexual desire...