Hiroshi Shiba is an exceptional car racer whose father is assassinated after the discovery of the Bronze Bell from an ancient civilization. This Bronze Bell is coveted by Queen Himika, who hails from that ancient era—the Yamatai Kingdom—and whose ambitions are to seize the Bell and dominate Earth. Hiroshi is left with a few items from his father that enable him to transform into a full-sized mecha warrior, Steel Jeeg. With these abilities, along with the help of his father's brain implanted in a computer and the assistance of Miwa "Micchi" Uzuki, they set out to neutralize Himika's plans for world domination.