Upon demonstrating his capability as the potential ruler of Planet Kinniku, Kinnikuman is confronted with a hurdle during the crowning ceremony as five other individuals identifying as Kinnikumans assert their authority as the legitimate successor. For the purpose of determining the authentic successor, a Royal Survivor Tournament is conducted. Empowered by his friends' support and his honed ability in executing the Muscle Spark's Ultimate Technique, Kinnikuman engages in a fierce contest to earn his rightful position as the king.