Rekkyou Sensen

In 2206, due to environmental pollution and resource depletion, there are only 100 years left for human habitation on Earth. Meanwhile, in order to reduce the world's population with the aim of preserving humanity, it is decided that a tournament will be held to decide which country will be destroyed. ︎The people who fight as their country's representatives are boys and girls with inhuman abilities who are hailed as the strongest of their nations. The tournament of heroes responsible for the fate of their nations, “The Nation-Toppling Battle,” begins!