Himika, the queen of the Great Kingdom, who had been sleeping for a long time, was revived. Dr. Shiba, who was expecting it, created Steel Jeeg. Hiroshi, which was turned into a cyborg by Dr. Shiba, transforms into Steel Jeeg and defeats Himika by joining forces with his partners Uzuki, Build Base, and Mechadon. Hiroshi will risk everything when an even more ferious enemy appear, the Dragon Demon Emperor.