The series followed a main character named Chirico Cuvie (Kiriko Kyuubi), a former special forces Armored Trooper pilot and former member of the Red Shoulder Battalion, an elite mecha force used by the Gilgamesh Confederation in its war against the Balarant Union -- both interstellar nations within the distant Astragius Galaxy. Gilgamesh and Balarant had until recently been locked in a century=old galactic war whose cause was long ago forgotten. Now, the war is ending and an uneasy truce has settled.