When a young man, Yusuke, is fired from his job and kicked out of his home, he has to live with his brother and sister-in-law until he finds a new job. However, there is no place for him at home, as his brother scolds him every day, "You're such a poor man, you're still a virgin at the age of 30." To regain his confidence, Yusuke makes a lifelong wish to his sister-in-law Yuna, asking her to take away his virginity. Yuna sympathizes with Yusuke and offers to let her body relax a little...