A daughter-in-law who lost her husband in an accident and a father-in-law who lives in diapers. As the two lonely people live together, they become close and before they know it, they start to feel carnal desire for each other! When the daughter-in-law Megumi is wiping the urine off the toilet that her father-in-law has soiled, she becomes excited by the smell of urine and starts masturbating alone in the toilet. Her father-in-law peeks at her! From here, the child-faced daughter-in-law's masochistic attitude becomes apparent, and the father-in-law becomes obsessed with sex, devouring his daughter-in-law's body.