The US and fictional Middle-Eastern Belgistan are at war. The US takes heavy loses when Belgistan uses their giant robots, but they get help in military aid from Japan including a superb giant robot and its Japanese pilot.

The flames of war explode in the Middle East as two shadow forces unleash monstrous new weapons of mass destruction. But in a world in which giant robots are real, the most dangerous weapon of all lies buried within a human mind. Yuushirou, the fourth son of the mysterious and powerful Gouwa family, finds himself at the center of events that will change the future of mankind forever. Nothing can prepare the human race for what is about to be unleashed in Gasaraki.—Sunrise