22世纪的近未来发生了一场世界战争，大战过后世界被地壳兵器破坏的面目全非。主人公伊达尔偶然遭遇了神秘机械军团的袭击，身为机士的养父兰迪斯为了让他逃走而壮烈牺牲。伊达尔开始了寻找杀父仇人的旅行。在路上他结识了失去记忆的机士杰克逊和美丽的女猎人沙哈丽，三人一起在冒险中与神秘机械军团对抗。

Ace female test pilot Kusomoto Elle humiliates macho tank driver Lt. Kilgore in the first demonstration of the advanced personal battle tank, the MADOX. Kilgore vows revenge, and gets his chance when the army rather carelessly loses the prototype in Tokyo. The MADOX is found by engineering student Sujimoto Kouji, who doesn't take the time to completely read the manual and ends up zooming around Tokyo trapped in a machine he doesn't quite know how to operate. Guess who gets the job of stopping the now mobile missing MADOX? Poor Kouji. If he's late for his date, it's over between him and his girlfriend. His current attire redefines the term "over-dressed." And to top it all off, Kilgore wants to make him late- as in "the late Kouji!"

MegaTokyo 2033: Tokyo was left flattened as a result from a great earthquake.

A new city, MegaTokyo, was then recreated due in no small part from the aid of a multi-million dollar company, Genom Corp. Genom created and mass-produced biomechanical creatures called Boomers to aid in the restoration of MegaTokyo.

When the Boomers began to run out of control, the ADPolice at first tried to stop them, but they proved to be far more difficult to deal with than was first imagined.

Under the ever looming Boomer threat, a group of four girls from varying degrees of society banded together. Calling themselves The Knight Sabers, they were the only ones with enough firepower and resourcefullness to defend the fledgling MegaTokyo from Genom and it's berserk Boomers.