会社をクビになり家も追い出された青年・ユウイチは、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。自信をつけたいユウイチは、兄嫁・有紀に童貞を奪ってくれと一生の願いを申し出た。ユウイチに同情する有紀は、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…。

Yuichi, 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." Desperate to gain confidence, Yuichi makes a lifelong wish: to have his virginity taken by his sister-in-law, Yuki. Yuki, feeling sorry for Yuichi, agrees to let him have his way, just a little, but the moment she penetrates him, she is overcome with an overwhelming pleasure…