Hiroshi Shiba, a skilled car racer, finds his father murdered after the discovery of the Bronze Bell, an artifact from an ancient civilization. Queen Himika of the Yamatai Kingdom, who hails from that same era, covets the Bell and seeks to use it to conquer the world. From his father, Hiroshi inherits relics that allow him to transform into a full-sized mecha warrior known as Steel Jeeg. With his father's consciousness stored in a computer and the support of Miwa "Micchi" Uzuki, Hiroshi fights to thwart Queen Himika's plans for global domination.