A girl who loved Human Tanks now stands on the battlefield as a commander. The Kingdom of Japon and Empire of Japon have warred for dominance over all of Japon for over two decades. The war grew intense as the Fourth Armored Corps rebelled and declared independence. The most powerful military unit of the Imperial Army renamed itself and revolted against the Empire as the Daihon'ei Army. Half a year has passed since the rebellion. The Imperial Army, while thought to be at a disadvantange, began their fierce assault. Within their ranks were Royal Human Tanks. "Find and eliminate the traitor that leaked information of our Human Tanks." The youngest Lieutenant of the Royal Army is assigned with this mission. Our heroes begin their battle in these severe wartimes.