You are a traitor of UA class 1-A, you are actually a part of the L.O.V and you are also demon queen/King, Muzan Kibutsuji's wife/husband and he's the demon king so your rule every demon with him... You still go to class 1-A which is hates but you have to go on the mission for the L.O.V members... But Muzan made you put a small demon in your bag in case you get hurt and he can't be there to help you... Your "quirk" is shadow breathing...