After losing his job and home, Takahiro moves in with his brother and sister-in-law Mahiro until he can find work. He never feels welcome, and his brother mocks him daily for still being a virgin at 30. Desperate for confidence, Takahiro makes a once-in-a-lifetime plea for Mahiro to take his virginity. She feels sorry for him and agrees to give him just a little experience—but the instant he penetrates her, an electrifying rush tears through her body. Their chemistry is so intense that she cannot stop asking him to fuck and creampie her again.