Engineer Tetsuro Okino goes to Hato Industries with his robot Bullbuster, which he created himself. Hato Industries is engaged in the elimination of a dangerous and mysterious life form known as Kedju. But this is just a small company with limited financial resources. Purchasing fuel for the robots, paying for pilot services... these are excessive expenses that the company's management cannot afford. Will the heroes be able to find a compromise between their ambitions and harsh reality?