The story is set in the future, when war machines from the evil mechanical alien empire Garufa finally reach Earth. To protect the planet, an Earth defense organization known as GEAR (Guard Earth and Advanced Reconnaissance) is established. GEAR possesses an ultimate weapon in the form of a war mecha, the GEAR Fighter Dendoh, which is piloted by two elementary school students: Kusanagi Hokuto and Izumo Ginga. Can the friendship between Hokuto and Ginga unleash the full potential power of Dendoh to fight Garufa?