I just want to be a side character, so what?

This year 2025, ten years after a meteor shower unleashed Earth's mana energy, the world is ravaged by evolved animals to monstersthat have reduced the human population to a mere 10%. Humanity's survival hinges on the discovery of Mana Orbs, fragments of the meteors, which awaken the Mana Heart within individuals, granting them control over the six elements: wind, fire, earth, water, light, and darkness.