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.

'Where do we go from here?' SPOILER ALERT! For those who haven't read the manga yet, please know that this story has a lot of spoilers. You have been warned. Also note that there are going to be several ships that I'm going to insert into the story. That's all! Have fun reading.

He will do whatever it takes to accomplish two things: Protect his sister and fulfill his father's longing. After all, it's cursed blood