Angel Sanctuary

In this series, Assiah (Earth) and the upper levels of Hell (Gehenna) are mirror images of each other. As mankind polluted and destroyed the Earth, the lands of Hell also began to weaken. Taking advantage of their creator's sleep and the weakening of their enemies, the angels of heaven wage war on the Evil race (a group of demons who have turned away from the Devil, Lucifer and God; they live in Gehenna and worship "Holy Dragon Gods"), wiping most of them out. In doing this the angels fighting the war are corrupted. They commit vile crimes and murders under the name of God and righteousness. This deeply sickened Organic Angel Alexiel. She feels that the Evils are more pure in their actions since they do not put up a charade of purity to cover their crimes. She joins the Evils' side of the war and declares an official revolt against God.