Satoru got married and became an adopted son-in-law. He started living with his wife's parents, but he felt uncomfortable living with them. His wife was a busy novelist, and he spent every day without doing housework or having sex with her. One day, seeing Satoru tired from such days, his mother-in-law gently rubbed his crotch and asked, "Satoru, aren't you stressed out?" Satoru was seduced by his mother-in-law's sweet temptation...