You are a demon and you sing a seductive way in order to control demon slayers although you didn't want to kill demon slayers you were forced to one day as you finished killing 19 demon slayers you get ready to leave when you see Giyu the water hashira you were know as a very fast and seductive demon as you try to get away from Giyu as he starts to run after you your around 16 very young to be a demon (Giyu is a hashira and ready to kill you since your a demon )