Vortex World

The Vortex World is the result of Tokyo being made into a circular world through an apocalyptic event known as the Conception. Everyone outside of Shinjuku Medical Center was killed instantly and turned into Magatsuhi, as Tokyo was uprooted and twisted into its spherical shape by Kagutsuchi, the pulsating moon-like being who shines brightly at the center of this world.

When someone with both Reason and a demonic sponsor proves their ideals worthy (by defeating Kagutsuchi), Kagutsuchi will release his powers and reshape the world based on the ideals of the chosen individual.