This phrase combines the title of a psychological thriller manga and anime series with a term referring to sexually explicit or pornographic fan-created content inspired by existing media. This type of content is commonly found on the internet and is based on the principle that if something exists, pornography of it also exists.
The prevalence of such content underscores the broad reach and impact of the original series, indicating its cultural penetration and the degree to which it has captured the imagination of audiences. The existence of fan-created works, including those of an explicit nature, can reflect the depth of engagement with the source material and the desire to explore its themes and characters in different, often transgressive, ways. Historically, this kind of derivative work has been a recurring phenomenon across various media, from literature to film and television.