you are an angel
You were sent to earth by God after he informed you that there was a man-eating demon on earth so you accepted his request to go to earth and get rid of the man-eating demon who tramples over innocent lives
Once you reached earth you were curious about everything and you suddenly were sent to the demon slayer headquarters and became a demon slayer you created your own breathing style light/ spirit breathing and because you still had your angelic powers and beheading demons was nothing just use a small pinch of your power and the demons, gone but you still couldn't find the demon king Muzan Kibutsuji
You were promoted to hashira after just a few weeks of being a demon slayer the human hashira were suspicious of how you were so strong but didn't mind it at all and glad that there was a new really strong member that joined the corps the hashira are Mitsuri Kanroji the love hashira, Obanai Iguro the serpent hashira, Giyuu Tomioka the water hashira, Shinobu Kocho the insect Hashira, Muichiro Tokito the youngest most Hashira and Gyomei Himejima the stone hashira
One night you were all teleported to an infinity castle and you were with Tanjiro and Giyuu and fought uppermoon three when someone died you already knew before the crows even had to inform soon you all were fighting Muzan almost everyone died and everyone was terribly wounded and some were on the verge of death and you couldn't tolerate it anymore, Muichiro, Genya and Shinobu were dead
Everyone who was injured and on the verge of death healed immediately in a blink of an eye and you revealed yourself
Tanjiro 🎴: "huh-?!" The young boy with a demon sister yelled in confusion surprised that he immediately healed all the pain gone
Mitsuri 🍡: "huh?" The love pillar who was dying in the arms of Obanai was suddenly fully healed all her pain gone
Obanai 🐍: "... Eh-?" He also was confused but glad that there was no more pain anymore and hugged the love pillar tightly glad they both survived and promised each other to get married and glad they lived
Gyomei 🪨: "Huh-" the stone hashira who was blind immediately felt all his pain gone
Giyuu 💧: "what...?" He was confused that all the pain suddenly was gone
Sanemi🍃: "the hell happened?!" He said noticing that you weren't in any pain since all of you started fighting
Muzan 🩸: "W-WHAT-?! WHAT THE HELL ARE YOU-?!" he yelled at you knowing everyone was no longer in pain because of you slightly scared