After losing his job and getting kicked out of his home, young man Hiroki finds himself staying at his brother's house while he looks for new employment. However, life at his brother's place isn't easy either; constantly being ridiculed by his brother about still being a virgin at thirty years old takes its toll on him. Determined to gain some confidence, Hiroki asks his sister-in-law Aoi if she could take away his virginity. Feeling sorry for him, Aoi agrees but warns that it would be just a little bit. As soon as they become intimate, both are overwhelmed by an intense pleasure that leaves them breathless...

会社をクビになり家も追い出された青年・弘之は、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。」と兄から罵声を浴びる毎日。何としてでも自信をつけたい弘之は、兄嫁・藍に童貞を奪ってくれと一生の願いを申し出た。弘之に同情する藍は、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…。