The Swarm Wars have been raging for a while now. Earth has been invaded but, mankind has carved existence into the other colonies looking to help out with the conflict rookie Defender pilot Kyoto joins the Galactic Stargate Authority to protect mankind. But shortly after Kyoto finishes training, the Cydonia Base is attacked by the next swarm of Manti which has had the chance to fortify since the last event. The Manti push the GSA back to the far end of the Solar System, and begin to wipe the humans away forever. Kyoto will have to be dispatched on vital missions by the Battleship Memory, receive criticism from Colonel Adams, and learn more about the Manti from Dr. Mudo, to defeat the second alien swarm.