The human race on Earth was wiped out in a gallium bomb experiment. At the same time, some people who had left Earth to explore Venus lost their home and moved there to build a civilization. A thousand years later, the elite Earth Construction Corps, entrusted with rebuilding the Earth, set out for Earth, and the prince from Venus was a member of the Japanese unit. The prince and his team arrived safely on Earth, but what awaited them there were dinosaurs from the previous century! And then, a being that controls the dinosaurs appears...!?