Shiori lives with her husband's brother and father in her husband's family home. However, due to her husband's infidelity, Shiori has already decided to divorce. One day, just as Shiori was about to go to the ward office to pick up the divorce papers, the situation took an unexpected turn... Set in a decades-old traditional house, the beautiful wife is forced to have anal sex in the kitchen, living room, and hallway by her father-in-law and brother-in-law, who live with her. However, she gradually transforms into a perverted wife who feels more pleasure from her anus than her vagina, and Shiori reconsiders divorcing her husband and chooses the path of anal slavery.