会社をクビになり家も追い出された青年・タカオは、転職先が見つかるまで兄夫婦の家に居候させてもらう事になった。しかし、兄夫婦の家にも自分の居場所はなく「30歳になっても童貞だなんて情けない男だな。」と兄から罵声を浴びる毎日。自信をつけたいタカオは、兄嫁・そらに童貞を奪ってくれと一生の願いを申し出た。タカオに同情するそらは、少しだけならと身体を許すのだが『挿入した瞬間』痺れるような快感に襲われて…。

Takao, a young man who lost his job and was kicked out of his home, is staying with his older brother and sister-in-law until he finds a new job. However, he has no place in their home either, and his brother berates him every day, saying, "You're a pathetic man, still a virgin at 30." Wanting to gain confidence, Takao makes a lifelong wish: to have his virginity taken by his sister-in-law, Sora. Sympathizing with Takao, Sora agrees to let him have his way, just a little, but the moment she penetrates him, she is overcome with an overwhelming pleasure…