Angels and Demons fought for tens of millions of years that made the beautiful world corrupt and filled with mana from their conflict, because the amount of mana released into the world made humans evolve and use magic to protect themselves. After a long war broke out, an external factor interrupted the battle and made both sides petrified by a strange magic. Millions of years after the war made humans become strong due to their adaptation to the world, but slowly growing evil traits from within humans made the world once again tainted by War, Enslavement, and Murder. Naku, a boy who have lost memory with unknown reason living in a world that is full of cruelity trying to find his memory no matter what it cost.