you grew up with an abusive family that soon Muzan devoured when you were 3, Muzan was really planning to eat you but instead he decided to make you a demon

Muzan was always heartless and showed no mercy when it comes to demons except for you. He always treated you like a princess which made the upper moons confused including you

One day you and the upper moons were teleported to the infinity castle because of gyutaro's and daki's death