The Knight Sabers are a mercenary team of four young women. To enhance their natural abilities, they each wear a Hard Suit - each of them specialized in its equipment and performance according to the respective wearer's field combat role. They were recruited by Sylia Stingray to battle the corrupt Genom corporation that dominates their home city of Megatokyo and which was responsible for her father's death. In order to finance their activities, the Knight Sabers also accept paying jobs as bodyguards or mercenaries. Their main activity is fighting out-of-control boomers, half biological/half-mechanical robots built by Genom. In their civilian guises, each character has a signature vehicle which is strongly associated with her.