According to the Republic of San Magnolia, their ongoing war against the Giadian Empire has no casualties—however, that is mere propaganda. While the silver-haired Alba of the Republic's eighty-five sectors live safely behind protective walls, those of different appearances are interned in a secret eighty-sixth faction. Known within the military as the Eighty-Six, they are forced to fight against the Empire's autonomous Legion under the command of the Republican "Handlers." Vladilena Milizé is assigned to the Spearhead squadron to replace their previous Handler. Shunned by her peers for being a fellow Eighty-Six supporter, she continues to fight against their inhumane discrimination. Shinei Nouzen is the captain of the Spearhead squadron. Infamous for being the sole survivor of every squadron he's been in, he insists on shouldering the names and wishes of his fallen comrades. When the fates of these young souls from two different worlds collide, will it ignite the spark that lights their path to salvation, or will they burn themselves in the flames of despair?

The disappearance of the Spearhead Squadron beyond the horizon does little to hide the intensity of the Republic of San Magnolia's endless propaganda. Vladilena Milizé continues to operate as "Handler One," the commander of yet another dehumanized 86th faction's squadron in the continuous war against the Legion. On the Western Front, Shinei Nouzen and his squad are quarantined in a military base controlled by the Federal Republic of Giad, formerly known as the Giadian Empire. The newly-established government grants the saved Eighty-Six full citizenship and freedom. Housed by the president Ernst Zimmerman himself, the group meets his adoptive daughter and the last Empress, Augusta Frederica Adel-Adler. However, within the calm of this tender society, Shinei and his team feel that their purpose is on the battlefield. Before long, they are once again in the midst of the Legion's onslaught as a part of the Federacy's Nordlicht Squadron, accompanied by Augusta Frederica. But, as history repeats itself, they realize that no matter the side, death and pain on the front lines are the only comfort they know.

The world of Lingalind is surrounded by a mystical wall with seemingly nothing beyond its confines. Worshipped as the mother of the land, the wall delivers celestial gift capsules called "Rakuho'' to locations across the continent. Arriving once a month, the capsules contain metallic armbands that allow the wearer to transform into a mechanical being known as a "Briheight." As a result, Lingalind is thrown into constant turmoil by its warring nations, all hoping to strengthen their military prowess by procuring the offerings for themselves. One day, a Rakuho crash-lands in the countryside with an unexpected inhabitant—a mysterious black-haired man. All eyes are set on this strange newcomer, who calls himself "Back Arrow," when he claims to have hailed from a place beyond the wall—a revelation that can potentially unravel Lingalind's entire dogmatic foundation.

In the continent of Cruzon, an impending war between the Kingdom of Krisna and the nation of Athens is brimming. The people of this land are able to use quartz for whatever purpose they desire. Yet one person, Rygart Arrow, is not. He is an "un-sorcerer," a person unable to use quartz. But this characteristic will enable him to pilot an ancient Golem, one strong enough to put up a fight against the invading army of Athens.