However, just as he is about to die, Muzan does something to Tanjiro that has the power to change humanity forever. At the very end of the battle against Muzan, when the King of Demons is on the ...

the Tanjiro and the rest of the Demon Slayer Corps are free to hang up their swords and live out the remainder of their lives in demon-free peace. And they do, until they all peacefully die of old ...