AD 2100: HUMANS EXTERMINATED BY THEIR OWN NATURE DISTRUPTION AND ESCAPE TO MARS LEAVING BIO-COMPUTER FOR ENVIRONMENTAL RECUPERATION OF EARTH. ONE DAY HALF A CENTURY AFTER HUMANS ARRIVED, MARS WAS ATTACKED BY STRANGE FLYING OBJECTES. TO FIGHT THESE ENEMIES, THE DIRECTOR-GENERAL OF THE DEFENCE AGENCY ORGANIZED THE TASK FORCE ARMY AND STARTED THE DOG FIGHT WITH INVADERS QUICLY. THE OPERATION WAS CALLED "ACROBAT MISSION" AS IT EXCEEDED THE PILOT'S TECHNICAL LIMIT.