In the 21st century, humanity resides on two worlds. After an ice asteroid collided with Venus, extensive terraforming efforts transformed it into a planet capable of sustaining life. Earth colonists subdued the hostile environment and have prospered for four generations. However, they also carried the darker aspects of human nature. Venus is poised to become hostile once more. Hiro Seno, a skilled motorcycle racer, witnesses the initial attack on his nation, Aphrodia, launched by the rival state of Ishtar. Massive battle tanks and warplanes swiftly devastate the city. The Aphrodian military mobilizes rapidly to counterattack... and despite his aversion to war, Hiro finds himself battling for survival on the front lines.