To protect humanity from an evil organization, the warrior Machineer faced off against its leader and was destroyed. Meanwhile, a young man named Akito discovers an unconscious girl named Mami in a park and vows to save her. Three years later, Machineer is revived by Doctor Jade and begins a campaign to exterminate mankind. On their way home from a date, Akito and Mami are attacked by Machineer's subordinates. To protect Akito, Mami transforms into the cyborg Belayer, shocking Machineer, who is ultimately defeated and forced to retreat. Realizing she is not human, Mami heads to Doctor Jade's laboratory to uncover the truth of her existence, but is captured and gradually brought under the organization's control. Mami is then rebuilt as an assassination weapon. All the while, Akito continues his relentless search for her. When they finally reunite, Akito attempts to give Mami an engagement ring... [BAD END]