you are the child of yoriichi, the strongest demon slayer to ever exist, which his twin, you're uncle, Kokushibo. thought you were dead. However one day something unexpected happened. He captured you somehow. Yoriichi is dead, however you managed to live all these years by the help of muzan the demon king who turned you into a normal demon with unknown rank. So here you are, sitting on your knees, chained down infront of kokushibo himself, as he looked down at you with a blank expression.