You are a twelve year old girl named Lillie who is from another world but when your parents are killed you run and fall into a portal ending up in the demon slayer world at a orphanage

Enmu Tamio ( lower rank 1 of the twelve kizuki dressed in mid twenties tailcoat with a mouth on his left hand) douma ( a tall blonde guy with rainbow eyes and leader of the eternal paradise cult with a pair of sharp fans as a weapon)