Asahi, a wife, was living a happy life with her kind husband after purchasing their dream home. However, her husband suddenly proposes that she live with her father-in-law... Asahi, who has never been good with her father-in-law, was troubled, but after her husband strongly persuaded her and her father-in-law's circumstances of living alone after losing her mother-in-law, she reluctantly agreed to live with him. However, this is where the nightmare began... Asahi, who is not satisfied with her nighttime activities with her husband, happens to be seen masturbating in the living room by her father-in-law. Knowing her weakness, her father-in-law starts to play sexual pranks on Asahi, and the pranks gradually escalate. Asahi resists at first, but her body and Kokoro are captivated by her father-in-law's skillful training...