Meat has been kidnapped by Iron Mask. In order to save Meat, the treasure of Inmora Island is needed. Furthermore, the treasure is hidden in the Seven Story Tower, which is guarded by the brutal Warrior Choujins. When Kinnikuman asks Terryman and the Justice Choujin to help him, for some reason they all refuse. Alone, Kinnikuman heads to Inmora Island to fight the Warrior Chōjin and is overwhelmed by their great numbers.

Terryman, Robin Mask, and the other Justice Choujins are participating in a tournament in New York. Suddenly, Akuma Shogun (not the same as the guy from the series) arrives and defeats all of the Justice Choujins and absorbs their power... all except Kinnikuman (who was late for the tournament because he was busy eating gyuudon). Now Kinnikuman must defeat Akuma Shogun, whom now posseses the combined strength of all the Justice Choujins.

Kinnikuman is a superhero... a bad one. The one day a person named Meat tells Kinnikuman that he is the prince of an alien planet. Kinnikuman must save the day numerous times fighting evil chiyojins and competing in tournaments to prove himself to his family and to gain respect and money. 

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