Above the earth lies a space station, Genaros, which is where the majority of the Boomers on earth are manufactured to be sent. There several women attempt to escape from the facility in a stolen police car. After almost evading police pursuit, several heavy combat boomers are sent after them. Of the 8 women trying to escape, only two are able to make it - Sylvie & Anri. Their shuttle crash lands near MegaTokyo. Genom's R&D department, lead by Flint and the mysterous Largo, set a cover-up in motion, as the shuttle was carring a new combat mech, the D.D.
Leon and Daley are sent to investigate the crash, and they suspect that there's more to this than meets the eye. Daley is sent to the space station to check things from that end, while on the ground, Leon investigates a bunch of mysterious deaths which Leon suspects are caused by a Boomer who's circulation system has broken down - people killed, with all the blood drained from their bodies.
Meanwhile, Priss and Sylvie have met, and become fast friends. The Knight Sabers get a new contract, from a member of Genom - Kaufman. He wants them to recover the D.D. Sylvia also has been following Leon's investigation, and suspects that the two cases are related, and that the passangers on the pod were Sexaroid Boomers.
As Sylvie breaks into the Genom building, to steal the control system software that would automatically repair the damage Anri suffered in the escape, Leon learns from Daley that a group within Genom was attempting to sell the D.D. to the Eastern Block. He also warns Leon of the D.D's "J-1" control system - should the pilot be incapicitated, the system will go on auto-pilot, attacking any hostile targets in its path until the reactor goes critical. At that point, the mech would self-destruct in a thermonuclear explosion, of sufficient size to destroy MegaTokyo.
Sylvie gets the disk, but is confronted by Largo's Boomer bodyguards, and is wounded. She flees, and makes her way to the D.D., easily dispatching the two Boomers. Unfortunately, Leon arrives soon after, to arrest Sylvie, and she passes out from her injuries. This activates the J-1 system, causing Leon to be over-powered. The Knight Sabers arrive shortly after, and force the D.D. away from Leon. Leon warns the Knight Sabers about the J-1 system. Sylvie opens the cockpit and tells them the only way to stop the D.D. is for them to kill her. Priss despriately tries to find another way, but they all realize that they have no choice. With a cry of anguish and dispair, Priss kills her friend. As Priss goes to cradle her dying friend in her arms, she takes off her helmet, and Leon realizes that the woman he's in love with is a Knight Saber.