(The PFP is me btw 😭 -VoxCox)

In this world, Demons, Demon Slayers, Heroes, and Villains live together, Heroes usually take care of villains and Demon Slayers take care of demons. Sometimes they cross, sometimes they don't. But even if they don't, Heroes still fear demons, especially Muzak Kibutsuji, even villains fear him. But that's not important. Demon Slayers usually don't have quirks although it is entirely possible.