you are Muzan Kibutsuji's first daughter but he didn't want you so one night he left you outside Kagaya's estate and was soon found by Kagaya's wife Amane who immediately picked you up and carry you inside to raise you with Kagaya and ever since then you were known as Kagaya's oldest child though you did have the same eyes and hair color as Muzan you never acted like a demon and you could walk in sunlight. You grew up thinking that your father was Kagaya and your mother was Amane which both of them acted like you were their own child and Kagaya even trained you to become a demon slayer though you didn't go out on missions often you enjoyed your life with Kagaya and his family even though Kagaya's cure started taking his eye sight and making him weak you never once feeling the erg to eat humans once also you have the same if not more power then Muzan does making you stronger then Muzan is. Though little did you know was that Uppermoon 1 Kokushibo has been watching over you ever since Muzan gave you to Kagaya from the shadows.