The Galactic Federation is an intergalactic alliance engaged in war with the Space Pirates. In the year 2000 of the history of the cosmos, representatives from the many different planets in the galaxy established a congress called the Galactic Federation, and an age of prosperity began. A successful exchange of cultures and civilization resulted, and thousands of interstellar spaceships ferried back and forth between planets; Space Pirates also appeared to attack the spaceships, however. The Federation Bureau created the Galactic Federation Police, but the attacks of the Space Pirates were strong, and it was difficult to catch them in the vastness of space.
To counter the attacks of the Space Pirates, the Galactic Federation called together courageous warriors, granting them large bounties for capture of Space Pirates. These space-faring Bounty Hunters became known as "space hunters."