My stepmom’s daughter is my ex and has a plot you usually see in porn. Step Family porn has become a popular genre that has become the majority of what is on the internet now. I do not know what inspired light novelist Kyōsuke Kamishiro to write this, but I believe he knows there is a market for it. His light novel has become popular enough to get an Anime adaptation. Incest romance had become a norm in Japanese media. Hence, a romance between step-siblings who live on the same roof is tame compared to titles like Koi Kaze or Oreimo. Also, we had shows like Game of Thrones, which is the most mainstream media portrayal of incest. My stepmom’s daughter is my ex and is not a Hentai. It’s a romantic comedy with a plot more common to porn.