Hisako came to visit her daughter's apartment for the first time in a long time. An apartment that seems to be second-hand but purchased by my daughter and son-in-law. Toshiko, who was relieved that the daughter and his wife were doing well, told the daughter and his wife that he wanted to see his grandson, and the daughter got angry and stood up. The son-in-law says to Toshiko who is crazy. That there is no night life all the time. Hisako apologized for his rant, but each other became awkward. At night, Toshiko witnesses a son-in-law masturbating with his underwear that he had been wearing. Toshiko, who thought she was feeling lonely because of her daughter, finally helped her son-in-law to ejaculate. Speaking of my son-in-law, the erotic act of swinging for a while ignites the fire, and he spends the night on his sleeping Toshiko. Toshiko dislikes it, but gradually feels the situation where she can't make a voice and the desperate caress of her son-in-law. Toshiko refuses to insert it, but at the moment when she is pierced by her son-in-law's son-in-law, she feels so comfortable ...