After losing both his job and his home, 30-year-old Takao moves in with his brother and sister-in-law Sora until he can find work. He has no place even in their home, and his brother humiliates him every day for still being a virgin. Desperate to gain some confidence, Takao makes a once-in-a-lifetime plea for Sora to take his virginity. She feels sorry for him and agrees to let him have her only briefly, but the instant he enters her, an electrifying rush of pleasure hits them both.