Doctor Raichi, an intelligent scientist of the Tsufuru race, during the conquest of the world by the Saiyans. He is creating a special robot that can create "combattentive fantasy" or "fighter demon" driven by Tsufuru's hatred of the Saiyans.However, he was killed by the Saiyan people, and when combined with the robot, how did Raichi's lifeless body drift into space on the space shuttle?In the meantime, however, the active supercomputer Hatchyack (this is the name of the machine) began to develop and complete, thus enabling him to create many "fighter demons" as well as Raichi's own clone body that would help him with his project. The capsule finds refuge on Planet Dark, a planet at the end of the universe. There, supercomputer Hatchiyack continues to hatch until it sets up a demon squadron, one of which is Dr.Raiji Ghost Raiji, whose only wish was to exterminate the last remaining Saiyans.