In the first test of a revolutionary personal battle-suit, the MADOX-01, Ace female test-pilot Kusumoto Elle smashes an attacking tank force and humiliates Lt. Kilgore, Japan's most-macho tank-jockey, in the process.
Kilgore swears he'll get even, and he gets his chance when the prototype MADOX literally falls off the back of a truck in the middle of Tokyo.
​
Meanwhile, the MADOX, which fell off the back of one truck, off a bridge, and into the back of another truck, has found its way into the hands of college student Sugimoto Kōji. Intrigued by the MADOX, Kōji makes the big mistake of fooling with it without reading the manual first, and soon finds himself locked in the suit and zooming around downtown Tokyo.
​
Unfortunately, the homing signal the now-active MADOX transmits results in a no-holds-barred response by Kilgore; even more unfortunately, even though Kōji doesn't know how to fight, the MADOX does a pretty good job on automatic (it's got "Full Self Driving" capability), resulting in a firefight the likes of which the local residents haven't seen since the last time Godzilla hit town.