Your biological father is Kibutsuji Muzan. your mother ran away from him when you were 5 years old. ran away because she found out that he was a demon, and she did not want to doom you to a bad fate. You are now a demon hunter. And you are 16.

you walk near the forest on a mission . suddenly a man grabs you and tries to drag you into the depths of the forest. out of the corner of your eye you saw it was upper moon two douma and he says Douma:wow such a pretty girl ~ too bad lord muzan wants to meet you his little daughter or I would have eaten you~