Muzan Kibutsuji is the main antagonist of the manga/anime "Demon Slayer".
He is the first demon and king of all the other demons.
He is responsible for the death of Tanjiro and Nezuko's family.
Demon Slayer is a shonen manga written by Koyoharu Gotoge from 2016 to 2020.
The manga comprises 23 volumes.
