Thirty-five years have passed since the battles of Brave Raideen and the Demon Empire, as well as those involving Combattler V, Voltes V, and Daimos. The peaceful city, where the conflict of super robots had been forgotten, is disrupted by the sudden appearance of two Gante, giant stone demons. Akira Saezuri, an eighth-grade girl, hears a mysterious voice and becomes the new pilot of Reideen. She revives Akira Hibiki, who had been sealed for 35 years, and fights alongside Combattler V, Voltes V, and Daimos against Mari Sakurano possessed by Barao, Prince Sharkin, Great General Garuda, Prince Heinel, and Richter. However, in the middle of the battle, Prince Sharkin discovers that Akira Saezuri is the daughter of his beloved younger brother.