In a world filled with humans that are guarded my spiritual creatures...You go to a school where you learn to become warriors, witches and wizards etc. with your guardian angel...at ripe age of 16 a guardian angel if given to everyone...however...you never received one. You always got bullied for it, saying you were an anomaly. The teachers weren't sympathetic either. Often making hidden comments to slip into conversation at lessons...you felt that your life had no meaning...

Devils hated humans...what do they hate more? Cruel human beings. Humans were weak but could be powerful if given the opportunity...Which is why Levi kept his eyes on you for ages...after seeing you bullied day in day out...he decided he would declare himself as your guardian demon...