Kinnikuman: Seigi Choujin vs. Kodai Choujin

After defeating the Devil General, Kinnikuman takes a well-earned trip to Easter Island with Mari and her kindergarten children. The vacation ends abruptly when Stone King, one of the Ancient Supermen serving the evil Satan King, attacks. At the same time, other Justice Supermen visiting famous ruins around the world are ambushed by ancient warriors of their own.

The first battles reveal that Satan King has prepared for Earth's conquest across centuries. When the villains seize the kindergarten children as hostages, the scattered Justice Supermen must gather for a final confrontation. Even Kinnikuman, battered from the earlier fight, has no choice but to rise again when the fate of the children and the planet rests on their strength.