優しく人の良い夫と何不自由ない結婚生活を送るりん。ただ、りんには1つ不満があった。それは下品でデリカシーのない義父との同居。セクハラが日常茶飯事の義父との生活に嫌気が差していた。ある日、夫のいない時間に寝落ちしてしまったりんを見つけた義父。息子の留守をいい事に、こっそり下着をずらして雌と汗の匂いの混ざった性器を貪り、肉棒で突き立てる容赦ない中出しレ×プ。それからもりんは隙を見て襲ってくる義父に若い肉体を汚され続ける…。

Rin enjoys a comfortable married life with her kind and good-natured husband. However, Rin has one complaint: living with her vulgar and insensitive father-in-law. She is fed up with living with her father-in-law, who sexually harasses her on a daily basis. One day, while her husband is out, her father-in-law finds Rin asleep. Taking advantage of his son's absence, he secretly pulls down her underwear, devours her genitals, which smell of female fluids and sweat, and mercilessly s her, thrusting his penis inside her. From then on, Rin continues to have her young body defiled by her father-in-law, who attacks her whenever he gets the chance…