After losing his job and home, 30-year-old Masaya moves in with his brother and sister-in-law Mayuka until he can find work. Mocked daily by his brother for still being a virgin, he makes a desperate request: he wants Mayuka to take his virginity and give him confidence. She feels sorry for him and agrees to allow it for only a moment, but the instant he penetrates her, an electrifying rush of pleasure hits. Their unexpected compatibility soon has Mayuka repeatedly asking for more sex and creampies.