After being fired from his job and kicked out of his house, a young man named Yusuke decides to stay at his brother's house until he can find another job. However, he feels out of place there too, and is subjected to daily verbal abuse from his brother, who mocks him for still being a virgin at 30. Wanting to gain confidence, Yusuke asks his brother's wife, Yuna, to take his virginity as a lifelong wish. Yuna, feeling sympathy for Yusuke, agrees to help him out just this once, but the moment they have intercourse, she is overwhelmed by an intense pleasure...