This OVA is a spin - offom 1992 series of the year. Ten years ago, Dr. Sidzuma with his colleagues invented the engine,committed energy revolution. For progress it has paid a high price, and finally mankind has found the replacement of oil and gas. However rebelled sinister force in the darkest corners of the brightly lit world - a secret organization " Group of the Great Fire." Will the experts of Justice and Daisaku, the famous pilot giant robots,stop the villains?