Following the events of Battle Clash, the Battle Game Chiefs had been defeated. But the world did not return to peace, and instead new Chiefs and new machines rose up to rule the world. Like before, the Chiefs use giant robots known as Standing Tanks (STs). Seeing the world in trouble, the hero pilots, who had defeated the Battle Chiefs, decide to once again enter the Battle Game using an improved version of their ST, the Falcon. The truth behind the Battle Game will take the Falcon deep into space.