Hiroshi visits his bride's family home in the countryside to pay respects after their marriage. He is greeted by her mother, who reveals that she is actually a remarried woman with an intelligent and beautiful young wife. That night, he stays at their house out of kindness, but when he accidentally sees the naked body of Mrs. Mother while taking a bath, he becomes aroused and can't sleep well. As he leaves his room, he notices Mrs. Mother's bedroom partially exposed...

地方にある彼女のご実家へと入籍のご挨拶に訪れたヒロシ。出迎えてくれた彼女のお母様は、聞けば何やら、お父様とは再婚との事で、若くて美人で聡明な、いわゆる一つの、義理のママだった。その晩ご厚意で彼女のご実家へと泊まらせてもらう事になったヒロシだが、お風呂上がりの美人ママの裸体を目撃してしまった事から、どうにもこうにもムラムラして寝付けなくなってしまう。仕方なく部屋を出るとお母様の寝室がチラ見えして…！