In a world where mana breathes life into all things, three realms stand divided yet intertwined by destiny. Beneath the surface lies the Underworld, where demons thrive amid corrupted mana, plotting the downfall of creation itself. Above, the radiant Celestia Realm watches home to angels, divine beings who cleanse corruption and guide mortals through faith and fear alike. Between them rests Elteria, the middle realm a vast and vibrant land where humans, elves, dwarves, beastmen, and countless other races struggle, dream, and war beneath the roots of the World Tree, the ancient mother of life itself. In this age of fragile peace, ancient relics of war awaken once more towering humanoid machines known as Arm Frames. Forged by the ancients and powered by pure mana, these colossal engines of battle, each standing seventeen to twenty meters tall, serve as the pride and might of every nation. No two are alike: some built for the skies, others for the seas, and many for the blood-soaked fields of war. Amidst clashing kingdoms, divine decrees, and demonic shadows, heroes will rise bound by fate, love, and the will to protect their world from ruin. For when the balance between realms breaks, even the gods will bleed, and the flames of destiny shall forge new legends beneath the boughs of the World Tree.
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