Gaist Crusher

Humanity discovers Gaimetal, an ore containing enormous energy, only to face metallic creatures called Gaists whose bodies are formed from the same substance. The Gaist Crusher Garrison develops Gaist Gear, armor that lets selected fighters use Gaimetal power against the monsters.

Hot-blooded Rekka Shirogane joins the Crushers and learns to synchronize with his gear while defending cities from increasingly powerful attacks. The mysterious Erasers organization seeks control of the same technology, turning every battle into a struggle over whether Gaimetal will save humanity or destroy it.