Miyuki, a wife living with her father-in-law at her husband's parents' house, wants to have a baby soon, but she is frustrated by the lack of sex with her husband. One day, while cleaning the living room, Miyuki notices her father-in-law's lewd gaze fixed on her ass from behind... Her first anal training is repeated in the living room, kitchen, stairs, bathroom, and other everyday living spaces. Unable to resist the escalating anal torture from her father-in-law, she eventually offers her anus to him, depicting the Kokoro and anal conflict of the big-assed wife in this forbidden domestic anal release.