Kokoro Fandom (in-universe)

From Kokorodatabase

The Kokoro fandom is a very fearsome thing, as the characters of the dimension found upon breaking the fourth wall. They write strange doujinshi, have very complete but sometimes inaccurate Kokoro Fandom Guides, and many shops in their dimension give Kuroneko Satou free stuff for being a "very good cosplayer". They also seem to be fond of crack pairings such as Bob x The Sink.