After losing his job and home, 30-year-old Yuta stays with his older brother and sister-in-law until he can find work. Yet even there he feels unwanted, and his brother mocks him every day for still being a virgin at 30. Desperate for confidence, Yuta makes a once-in-a-lifetime plea to his brother's wife Kana: take his virginity. Feeling sorry for him, Kana agrees to let him have her just once—but the instant he enters, an electrifying pleasure runs through her body.