Cobra goes to planet Rifle to visit his old friend, Jingalo who built his ship the Turtle 15 years ago. While riding to Jingalo's place he is attacked by Pirate Guild machines. He finds Harvey the robot that shows him a videotape made by Jingalo before his death about the Pirate Guild takeover of the local mines and kidnap of his granddaughter Yuuko. Harvey takes him to the underground drilling machine and they leave to find the Pirate Guild's underground base. He battles the Pirate Guild machines and follows one to their base...