In 2026, the gravitational tide of the Earth and the Moon triggers a "spiritual tide", and creatures around the world begin to mutate. In the early stages of the recovery of spiritual energy, radioactive "spiritual mist" spewed out from geological faults. Humans awakened supernatural powers by absorbing spiritual energy, but this was accompanied by a very high risk of distortion. The old order collapsed, and the new federal government established a "scavenger" force to maintain order, while the surface gradually became the territory of alien beasts and mutant plants.
