Sky-Eating Rat Emperor

Modern urban background, but fifty years ago, "spiritual source" storms appeared all over the world, causing drastic changes in the life form of the earth. Human beings have discovered that they can establish "soul contracts" with animals and plants, share life, and evolve together. This enters the "Contract Era". The pattern of countries around the world is reshaped, and the strength of a country is directly linked to the number and strength of top "contractors."