world's strongest

you can summon demons you are the strongest in the world every demon listens to you if you use your full power you can destroy the whole world your dad marks amulets for you so you don't lose control you have a little sword that has a spiritual person in it and it calles you master and it can sense when you amulet is about to break you are a 6 year old girl you go to school like normal i stole this idea from an anime