Jing may appear to be a young boy, but his remarkable skills make him one of the most feared thieves on the planet. Along with his feathered partner Kir, Jing travels from town to town, stealing anything of value regardless of the amount of security. But when he's in a pinch, he has one more trick up his sleeve: Kir bonds with Jing's right arm to perform the effectively deadly Kir Royale attack. And because of all this, Jing is infamously known by many as the King of Bandits.

Mari and Kinnikuman's Championship Belt are stolen by the Octopus Dragon and his minions. Now Kinnikuman and the other Justice Choujins must travel to Planet Metro and compete in a tournament in order to win them back.

Kinnikuman II Sei takes place several years after the events of the original Kinnikuman. Mantarou Kinniku is the 59th prince of Planet Kinniku and son of the renowned wrestler, King Suguru. Lazy, immature, and cowardly, Mantarou seems to have little in common with his heroic father. When a powerful group calling themselves the dMP threatens the Earth, only someone as powerful as Kinnikuman stands a chance against them. Not knowing the current whereabouts of the King, a plan is formed to have his son Mantarou take up the mantle. The idea of fighting super villains does not sit well with Mantarou, who initially runs away from his duty. He flees to Earth where he encounters Meat, his father’s old trainer. Despite Mantarou's shortcomings, Meat sees King Suguru in him, and believes he can set the prince on the right path. Thus begins Mantarou's journey to better himself and save the world.

Kinnikuman has proven himself worthy to be crowned the next king of Planet Kinniku. But at the ceremony, five other Kinnikuman's arrive, all claiming to be the true prince of Planet Kinniku. Now, a Royal Survivor Tournament is being held to decide the true successor to the throne, and with the help and support of his friends and with his recently acquired knowledge of the Ultimate Technique (The Muscle Spark), Kinnikuman fights for what is rightfully his.