Aina, a wife who came to a guest house run by her father-in-law, Yukio, who also visited her mother-in-law's grave. With abundant nature and natural hot springs, she grew up in the city and her body and soul became open. However, her father-in-law, who has forgotten a woman for a long time, has a feeling of inferiority to Aina who unconsciously peels off her youthful body. That night, I can't stand it and attack Aina's sleep. Aina who felt pleasure while resisting intense caress and piston. The body that pierced the back of the vagina ached even the next morning, and I can not forget the pleasure.