Married for three years, Tomoko is a frustrated wife who barely has sex with her workaholic husband. Unable to resist, she indulges in masturbation and is caught by her father-in-law... Her body is given over to her lustful father-in-law's skillful words. When he accidentally touches her anus, she shows a sensitive reaction, and her father-in-law takes this opportunity to attack her. Awakened to the newly discovered pleasure of her anus, Tomoko is unable to be satisfied by the occasional sex she has with her husband, and she becomes frustrated. When her father-in-law finds out about this, he suggests that he develop an obscene anal hole...