Emiko married into her husband's family. She was welcomed by her husband's mother, Chizuru, and her older sister, Yurie, and was at the peak of happiness, but soon after her newlyweds, her husband left for a long business trip, and she had no choice but to distract herself from the loneliness of being left alone by indulging in masturbation. . Yurie who saw it gently touches her skin and heals the body that reacts with hypersensitivity. Then he persuaded her to go to her mother and learn the manners of this house. One day when I finally get used to being a member of the family, I get a phone call...