A very long time ago, the world experienced a golden age of elaborate technology. But time has done its share of work and the past is nothing but a rusty object laying in the vast deserts which cover the planet. Nevertheless, the past has not vanished into thin air... For with each decade comes an upsurge in mechanical power, called "the mechanical tidal wave". A wave of destructive machines rises and destroys everything in its path. So to fight fire with fire, every town has been provided a Ranger, a trigger-happy ace whose shooting zeal will determine the chance of survival for each city dweller...