In a steampunk world full of steam technology, a mysterious crystal capable of granting extraordinary powers, the Aetherium Crystal. It is the reason for the battle between the secret organization Vanguard Legion and the dark cult The Shattered Star. Bayu, a runaway with a dark past as a subject of crystal experiments, finds himself with the unexpected power to turn machines into weapons and armor. With his powers, he joins the Vanguard Legion to fight the threat of the Crystal Abomination-humans modified by the power of crystals by the global enemy, the shattered star. However, behind this conflict lies a dark mystery about the origins of the Aetherium crystal and Bayu's destiny that will determine the fate of the world.