In the 22nd century, humanity succeeded in creating “magic spells,” an unlimited resource that can produce the five
elements without any costs. The research of magic spells was categorized as “magic technology,” and the new alchemic theory created by its discovery was dubbed “magic.” Techniques like igniting fire at your fingertips or movingobjects without touching them were no longer a dream.

With the development of magic, the reformed United Nations placed a restriction on old world technology, due to its detrimental effects on the environment, and globally forbade the possession of arms. In its place, a new plan, one that would transform man into a more powerful entity, was set into motion—the Gear Project. For a while, the world saw peace as the number of wars among each nation decreased, thanks to the abundant resources provided by magic. But
there was no end to humanity’s foolishness.

Countless disputes regarding concession agreements on magic cast a dark shadow over the project, and instead of its original goal, it created biological weapons, beasts that possessed stout bodies and an enormous supply of mana. They were called Gears, named after the project that bore them. They would eventually become the cause of the great war that would leave a century-long scar on human history—the Crusades.

The catalyst of the war was a Gear once originally docile to humans. During the development of Gears, it was the only one authorized to be complete, an ultimate weapon withan absolute power to command others of its kind. Without warning and without reason, she declared war against humanity, calling herself Justice, and took with her all the Gears in existence. Thus began the Crusades.

The overwhelming might of the Gears brought humanity to the brink of extinction, but eventually Justice was destroyed
by the Sacred Order of Holy Knights, finally settling the longstanding war. Humanity won the war against the Gear threat, and with the loss of Justice, the remaining Gears fell into a dormant state.

Civilization entered a new era of peace, but they never knew what caused Justice to go berserk.