Demon Slayer: The King of Ghosts Walking in the World

He traveled through time and became Kibutsuji Muzan’s younger brother.
For commitment and responsibility.
Embark on a journey to kill Demon Dance Tsuji Muzan.
And in these endless years, more unknown secrets were discovered.
Why ghosts are born, and why the priests can predict the future…
The mastermind behind all this has gradually emerged.
[First World, Demon Slayer: Kimetsu no Yaiba] [Second World, Naruto]