When the Kikaika Empire launches a swift invasion of the solar system, swiftly conquering several planets, Earth's fate hangs in the balance. But hope emerges in the form of Eldoran, the ancient guardian and warrior of light. To combat the threat, Eldoran entrusts a group of 5th-grade students with three colossal robotic dinosaurs capable of merging to create the mighty Gosaurer. Now, these young pilots must harness this formidable robot to thwart the relentless advance of the Kikaika Empire.