Mom I want to be a demon Slayer when I grow up.

why son

because I want to destroy all the demon in the world so I can bring balance to the world if you really want to bring balance to the world you need to be strong than the high order themselves.

Mom who are the high order?

they are our creator and owner's of the universe, so if you want to be as powerful as them dear

I promise to be more strong than them

it impossible for mortals to be as powerful as there creator,but in history there is only one man who was reborn true pain and wage war against the high order