A battered combat robot lies twitching on the street, a result of the armored vigilante Knight Sabers. MegaTokyo may be a company town for Genom Corporation, but a few rise up to challenge the out-of-control robot "Boomers" that plague this future world. When the Armored Police Division (ADP) impounds the encrypted hard disc the Boomer was carrying, a number of new forces take interest.

Knight Saber Priss has a chance encounter with a stranger who's got a past connection with this mystery, as well as a deep hatred of Genom -- and Genom brings its own heavy hitters into the fray!