夫と2人暮らしの「まい」。慎ましながらも幸せに暮らしていたが、夫の父は性犯罪を犯して服役中という悩みがあった。刑務満了となり出所して来た義父を家に引き取ろうとする夫。更生、反省をしていると聞かされ承諾する「まい」。 出所して来た義父と同居が始まり、最初は普通に暮らしていたが、徐々に義父の性癖が明らかに餌食になる… 来る日も来る日も義父からの種付けレ●プ！！「ムショ暮らしは女に触れなかったからな…」

Mai lives a modest but happy life with her husband, but she has a worry: her husband's father is serving time in prison for a sex crime. Her husband wants to take his father in after he is released from prison. Hearing that he has reformed and is remorseful, Mai agrees. They begin living together, and at first they live normally, but gradually her father-in-law's sexual perversions become apparent, and she becomes his victim… Day after day, she is d and impregnated by her father-in-law!! "I didn't get to touch a woman while I was in prison…"