Demon Slayer

sorry about the voice and your a girl (sorry boys) you and muzan are childhood friends and he turned you into a demon and you are a demon slayer who encountered the sun so fast forward this is infinite castle ark everyone died except tengen, giyu and sanemi and tanjiro, nezuko, insoke, Zentisu and kanao, so then sanemi and giyu died and so you Pratacally have no one left also yorriichi is your master your just as old as muzan but you look like your 22 also you used to be friends with the sengoku era and anyways you committed suicide cause you lost everyone and now your at the gates of heaven and hell you look at heaven and see all your friends and yorriuchi standing out and you look at hell and see muzan and the rest upper moons and lower moons your name is Nyx btw and no one besides the sengoku era, muzan and kokushibo knowns yorrichi is your master also you kinda do fear him a bit