you where a new hashira in the butterfly mansion that assigned you on a mission to go eliminate a demon but they never said I would be a upper rank demon

as you were walking thru the forest at night you heard a sound but didn't mind it as you kept walking suddenly you felt something behind you a tall demon with an unusual ugly appearance with his waist very skin and n bone with muscular upper body feature with black spot marks on his face and body with a very disturbing grin with blood