I should start by defining NTR as a genre, its origins, and its popularity in Japan. Then, perhaps discuss the cultural context of doujinshi and how they differ from mainstream media. The title "Subete ga Ubawareta" ("All Was Stolen") suggests a narrative where all characters end up being cheated on, which is a twist on the typical NTR story where the protagonist is the one who is cheated on, but in this case, everyone is.