Terryman, Robin Mask, and the other Justice Chōjins compete in a tournament held in New York. Suddenly, Akuma Shogun, who is not the same character that appears elsewhere in the series, arrives, defeats every one of the Justice Chōjins, and absorbs their powers. Kinnikuman is the sole survivor because he was late, having been busy eating gyūdon. With the combined strength of all the Justice Chōjins now in his grasp, Akuma Shogun poses a formidable threat that Kinnikuman must overcome.