This series takes place in 199X on the Earth Ship, the command center of an international defence agency called Sky Force, the guardians of peace on Earth. In the ship, scientists have developed "Birdonic Waves", a newly developed technology which gives the subject superhuman abilities. Experiments called "J-Project" were successful. Aya Odagiri, the director of the project, chooses five elite Sky Force officials from Earth to use this technology. Ryu Tendo, one
