On a peace guarding command center known as the Earth Ship belonging to Sky Force, an international defense agency, scientists developed 'Birdonic Waves.' This waves were advanced technology that gave the subject superhuman abilities. Experiments for the J-Project were successful. Commander Aya Odagiri, the director of the project, chose five elite Sky Force officials from Earth to use this technology. Ryu Tendo, one of the Sky Force officers, was recruited along with his girlfriend Rie Aoi and three others for the J-Project. Ryu was successfully exposed to the birdonic waves, making him the first Jetman. However before the others could go through the process, the Earth Ship was attacked by the menacing force known as the Dimensional War Party Byrum which consisted of Back Dimensional Count Radiguet, Grey, and Tran. The Byrum conquered many worlds in the Back Dimension and they moved on to our dimension to conquer it. Rie fell threw a hole in the ship where Ryu tried to save her, but ultimately failed. Rie fell into space and Ryu presumed her dead, when in actuality, she was captured by Byrum where Radiguet wiped her memory and transformed her into Maria.