The Kikaika Empire, meaning mechanization, invades our solar system and within moments seizes Neptune, Uranus, Saturn, Jupiter, and Mars, then turns its focus to Earth. Yet one obstacle blocks them: Earth's ancient guardian and light warrior, Eldoran. To counter this threat he bestows a fifth‑grade class with three colossal robotic dinosaurs that can merge into the giant robot Gosaurer, which they pilot to halt the Kikaika Empire"s expansion in an effort to protect humanity from the relentless mechanized onslaught and preserve the planet's balance.