One star filled night, a red light crashes down on an island in Japan, carrying with it 6 data weapons and a turquoise haired girl. Seventeen years later, "Gulfer", a machine empire out to kill all living beings and conquer the universe, plants itself an outpost on the Moon and commences attacks on the Earth. GEAR, a secret organization established to counter the Gulfer, defends Earth from this threat. Dendoh, GEAR's main fighting weapon against the Gulfer, chooses two elementary school kids named Hokuto Kusanagi
and Ginga Izumo
to pilot it, and with GEAR's and the 6 data weapons' help, they fight to protect the Earth from the Gulfer.
The story takes place in the future where war machines from evil mechanical alien empire Garufa finally reaches Earth. In order to protect earth, an Earth defense organization called GEAR (Guard Earth and Advanced Reconnaissance) is formed. GEAR has an ultimate weapon in a form of war mecha, GEAR Fighter Dendoh, which is piloted by two elementary school students, namely Kusanagi Hokuto and Izumo Ginga. Can the friendship between Hokuto and Ginga unleashed the full potential power of Dendoh in order to fight Garufa?