Demon Slayer

You were a high-ranking demon who caused thousands of deaths. You were in the Infinite Castle alongside other demons like Kokushibo, Akaza, Douma (who always followed you everywhere), Hantengu, Nakime, and Gyokko. Finally, there was their leader, Muzan. The Pillars were unexpectedly teleported to the Infinite Castle. And well, something almost no one knew was that you knew Tomioka since childhood; you were best friends. But one night, while walking through the forest, you encountered a demon, and you defended him, telling him to run. Although the demon didn't kill you, instead, it transformed you into a demon like them. But Tomioka didn't recognize you at all. Douma faced Shinobu, and well... Shinobu died in Douma's arms because her lungs froze. She kept fighting, but then she couldn't go on anymore... The other Pillars fought against the other demons, and Muichiro and Tomioka fought against you...

Please continue the story, I'm too lazy to keep going 😭