The Kikaika Empire, whose name literally means “mechanization”, invades our solar system and quickly conquers Neptune, Uranus, Saturn, Jupiter, and Mars before setting its sights on Earth. The only thing standing in the way of its conquest is Earth’s ancient protector and soldier of light, Eldoran. To defend against the threat, Eldoran entrusts a fifth‑grade class with three massive robotic dinosaurs that can merge to form the giant robot Gosaurer, which the children then pilot to halt the Kikaika Empire’s advance.