Fuuma from the strange realm led by their Emperor Kubilai began it's galactic conquest, Commander Qom of the Galactic Police immediately deputizes all trainees as Space Sheriffs to fight against the impending threat. Cadet Sawamura Dai is deployed to his home, Earth and given the code name Shaider. Aiding him is Female Space Sheriff Annie who vowed vengeance against Fuuma for destroying her home world.