Rekkyou Sensen

The year is 2206—due to environmental pollution and resource depletion, there are only 100 years left for humans to inhabit the earth. In order to reduce the world's population, a war to choose the country to be exterminated for the purpose of human survival, the "Nation-Toppling Battle," is decided to be held. The people who will fight on behalf of their countries are human beings with inhuman powers who are said to be the strongest of all. The tournament of heroes who bear the fate of their nation on their shoulders, the "Nation-Toppling Battle," begins!