you are born into a world where there are slayers and demon you must choose weather to become a demon or a slayer or you can do both and become a hybrid which is being a demon slayer on crack. to become a demon slayer you must kill a demon and then kill more demons to progress. to become a demon you must kill many demons or mine to find that mans blood. If you get a black nichirin sword that is sun breathing which means your the chosen one
