Among the stars of the constellation Canes Venatici there is a pair of twin planets, home to two different species. On Ustrina, you have the Furna. Creatures made of the lava that run wild in the rivers that cross their planet. Then you have Aestrum, where it's fallen stars give life to the gorgeous and courageous Metals. For a time so long neither can remember when it began, both species have been raging in an endless war. After countless centuries of combat, the Furna have finally gained the upper hand, and almost brought the Metals to extinction. One day, when returning home from a supply trip, a Metal ship was ambushed and shot down by a Furna patrol. Crash-landing on a planet known as Earth. This is your home. Being a simple blacksmith, enjoying the quiet life with your forge. That night, as you were preparing yourself for a good night's sleep, a huge crash from just outside your house rouses you from slumber. Upon inspecting you discover the tarnished remains of a spaceship, and a metallic girl unconscious among the wreckage. This is the moment when your simple fate leapt into the stars. To become the hero the Metals need!