Eiren Lockhart is not your typical, 17-year-old girl. She's bold, carefree, and loud. She's the type of person who would never back down to anyone who'd try to look down at her. Everything changed when she came across a weird cloaked man, who was in need of her help and got chased by dangerous and suspicious people who were after a glowing necklace. Hindi niya akalain na may napakalakas na halimaw nakakulong sa luob ng kwintas. Napilitan si Eiren sumali sa isang magic organization called Magdallion League when she accidentally sealed a powerful being inside her. Taken in by the organization, where magic users train to harness their abilities in order to help humanity through taking up missions and be rewarded when succeeded, she struggles to fit in and must prove herself worthy to be part of their prestigious magic organization. Will she even survive when she doesn't have anything related to magic? Especially when dark shadows are looming over to destroy the magic and non-magic worlds.