Sleepbound

So basically....Your a hashira and you went on a mission! :D as it says in opening...Now this is after Entertainment district And somehow Muzan already replaced Gyutaro (dont ask me how) Her Bda called "Death and Disease Beyond sleep" infects the Person and their sleep, the more they sleep the higher her poision flows through their body [aka disease] and death rating increases, the only way to Stop it is to well....enter her rotten moldy layer..behead her and eat her crystal heart? [just a legit crystal] This includes all the hashira practically everyone in kny! ^^