A good looking Aide of mafia boss isekai'd into the world of man-eating demon AKA Kimetsu no yaiba (Demon Slayer) but not in taisho era but in heian era! When muzan was human?!!? what will he do? WARNING⚠ • ALL RIGHT TO THE RIGHTFUL OWNER KIMETSU NO YAIBA (DEMON SLAYER) DON'T BELONG TO ME • ALL PICS BELONG TO THEIR OWNER UNLESS SAID SO •BAD GRAMMAR / GRAMMAR MISTAKES