A young man named Yuuki was fired from his job and kicked out of his home. He decided to stay at his brother's house until he found another job. However, living with his brother and sister-in-law made him feel unwelcome. They constantly mocked him for being thirty years old and still a virgin. Determined to regain some confidence, Yuuki asked his sister-in-law, Aoi, to take away his virginity. Although she initially refused, she eventually agreed on one condition - that they would not have intercourse. As they engaged in intimate activities, Aoi experienced an intense pleasure that left her unable to move or speak...