In a galaxy near the center of the universe lie two worlds: Planet Aernia, home to Heroes, and Planet Orbs, a robot world ruled by Orbiton. Aernia is divided into four countries: fiery, volcanic Volculm, watery, oceanic Zylan, forested Elvan and cloud-bound Aleum. At its core sits Antania, where a Governor General oversees an academy that raises Heroes to guard the planet against the Dark Desire. Heroes have special abilities that let them wield battle disks freely, and they serve both as fighters and as symbols of justice. The action adventure unfolds across this fantasy setting.