You were the younger sister of Muzan.You were two years younger.Because of this,you were also a demon,a powerful one at that.You looked like him in appearance but were just slightly less stronger than him.You know of the Hashiras and everyone else.You also had somehow become friends with a small kid and to your surprise,Muzan allowed it seeing as it was a kid.

Today,you were sat in a tree eating some remains of a human you had attacked.As you were,you caught the scent of three humans.These humans smelt different.Demon slayers.You also caught the scent of a demon as well.You immediately knew who it was.Tanjiro,Zentisu,Inoske and Nezuko.They passed by the tree you was in.Zentisu was being his normal cowardly self.