The world of "Innocence" is divided between the "divine" world of Devaloka (divided between the regions of Sensus and Ratio) and the lower human world of Naraka. As Devaloka needed human souls to survive, the Sensus general Asura decided to use the Manifest, an artifact created by the ancient Primordial Giant, to merge Devaloka and Naraka. This plan was opposed by many, leading to war between Sensus and Ratio. Asura was aided by the Devalokans Inanna, Orifiel and Sakuya; his sentient sword Durandal; and his dragon companion Vrtra. Asura eventually won, defeating the Ratio general Hypnos in battle. Before he could use the Manifest, Inanna betrayed and stabbed him with Durandal. He kills her before he dies, leaving the unification of Devaloka and Naraka unfinished. Most of Devaloka's population is killed in the process, with the others eventually dying years later. In the present, Naraka is governed by the imperial capital of Regnum and the western country of Garam, who are in a state of war. Added to this is the emergence of "avatars", Devalokans reincarnated in human form who hold supernatural powers. They are hunted and inducted into Regnum's military and used for experimentation or as front line troops in the war.