Set in the far‑flung, medieval‑looking world of Arst, the story follows Prince Jordy Volder as he rises to confront the ambitions of the conqueror Marder. Jordy pilots the legendary giant robot, the panzer Galient, one of many ancient panzers preserved underground for thousands of years. Marder, wielding an army of advanced robot panzers, is conquering all of Arst in preparation for his plan to dominate the Crescent Galaxy.