Nao and I are not really parent and child. She was my wife's stepchild when we got married several years ago. After my wife passed away, I raised her alone as a single father until she became an adult. A few years later, she brought home her fiancé, whom she wanted me to meet. It was then that I realized I had feelings for both Nao and her fiancé, and felt jealousy towards them. One night after they were married and living together, I caught a glimpse of their intimate moments... Seeing how rough and disrespectful her husband treated Nao made me angry and aroused at the same time...

ナオとワシは本当の親子ではない。再婚相手の連れ子、それがナオだった。再婚して数年、妻が他界し男手一つでナオを育ててきた。数年後、社会人になったナオは紹介したい人がいると言い、婚約者を連れて来た。ワシはその時、ナオへの恋心と二人への嫉妬心に気付いた。そして結婚した二人と一緒に暮らす様になったある夜、夫婦の営みを目撃する。ナオにクンニもせず粗雑に扱う旦那にワシは怒りと性欲が込み上げて…。