Most creatures are blessed during their 'form' period, but a few are not and are cursed, the devil's curse. In this world, there are three noble creatures. One is the god who controls life, the other is the blessed human being, and the last is the devil, the Lord of Hell. This world is balanced. If there are demons, gods will be created to suppress them, but gods cannot completely control demons. The demon's power is not as powerful as that of gods. He cast magic on some 'forms' that were about to become humans, preventing them from becoming fully human. And we are these "cursed children"...