Prior to his Transfer

After defeating his mysterious pursuer with a last ditch effort attack. Kamado Tanjiro found himself in a world similar to his but different at the same time. With Muzan as his demonic mental companion, the Demon King known as Tanjiro will take the world by storm while surprised that both his sister and his counterpart in that world had their roles reversed. AU X AU. Crossover with FF.net fic Colors of the World.