On the planet Libertia, once called “the planet of death,” humanity built three giant mirrors that transformed the world into a seemingly ideal land. Professor Grace and his granddaughter Alcia live peacefully there until their home is attacked by Guild soldiers searching for both the professor and the special armor Legaciam. Legaciam can resist extreme heat, allowing it to survive in environments lethal to humans. Alcia, piloting Legaciam during a test to aid her grandfather, barely escapes the raid. The Guild, however, remains determined to seize Legaciam by any means.