Muzan Kibutsuji was nearly unrivaled in Demon Slayer—until one warrior pushed him to the brink like no other before or after.

and in the world of Demon Slayer, that is from the first demon, Kibutsuji Muzan. Muzan is the main antagonist of the story, and the original source of all the demons that plague the world.

However, beneath these borrowed faces, hid the same sinister entity: Muzan Kibutsuji, the origin of ... In his human past, before he became the demon feared by all, he murdered the very doctor ...