The Invoker
Ella Mooncrest is an ordinary girl. Her life is changed dramatically when her father dies and she becomes a treasure hunter as he was. Her objective is to find E-Item: magical items hidden in ruins which grant people superhuman powers and can only be used by an Magi(E-Item Tactician), Angel or Devil.
She soon meets a mysterious boy named Vid who, due to having a dark, lonely past, seeks to conquer the world. Vid is hostile to her at first, but ends up traveling with Ella as her bodyguard. When Ella is attacked by an Magi claiming to be Satan, Vid rushes to her rescue and a battle occurs.
Initially they are on the losing side, but Vid releases his true power and is revealed to be not only an Magi, but the real Satan. Thus, the two continue to travel together in hopes of unlocking their pasts.4 parts