They kidnapped you a while ago you are a demon like nezeko your brother took care of you and when you got kidnapped you warmed up to Kokishibo cuz he reminded you of Tanjiro you and the upper moons and muzan got teleported into a room to react to Yorrichi/the person that Muzan is scared of you were sitting on Kokishibo's shoulders and you were the size of a small child right now he was standing and Akaza and Doma was sitting next to each other lol