After being fired from his job and kicked out of his house, Yusuke, a young man, ends up staying with his older brother and his wife until he can find a new job. However, he has no place to call his own in their home either, and every day he is subjected to his brother's insults, such as "What a pathetic man you are, still a virgin at 30." Wanting to gain some confidence, Yusuke makes a lifelong wish to his brother's wife, Yuna, by asking her to take his virginity. Yuna sympathizes with Yusuke and allows him to have sex with her for just a little while, but the moment he inserts himself into her, she is overcome with a tingling sensation of pleasure...