Yukine, a daughter-in-law living with her father-in-law at her husband's family home, has been wanting a baby but is frustrated by the ongoing sexless marriage. One day, while cleaning the living room, she notices her father-in-law's lecherous gaze fixed on her buttocks. Despite this, Yukine continues to live in this state. In everyday living spaces such as the living room, kitchen, staircase, and bathroom, she experiences anal training for the first time. As her father-in-law's anal torment escalates, Yukine finds herself unable to refuse and eventually offers her anus willingly. This is a taboo story of anal liberation within the family, depicting the inner conflict between the heart and anus of a big-assed daughter-in-law.
