In the year 2099, mankind has colonized parts of the Solar System thanks to the evolution of space travel. To venture further beyond what man has accomplished, the space vessel Starlight is launched. After rescuing a mysterious girl from a wreckage near the asteroid fields, the crew of the Starlight plot a perilous journey towards the Canopus system in search of the planet known only as "Odin" - the possible key to all forms of life.

Sun Goddess of the Solari, Leona came to Earth in 2014. The genetics of God hidden on Earth has started to awaken. The first few awakenings include the Power of the Galaxy and God of War. An invasion by the alien Tao Tie, just to entertain Death God Karthus, are on the way to Earth. The Angels, the Devils and God seminary groups that have been monitoring the genetics of God on Earth make their moves. The God Seminary assembled the scattered warriors across Earth who carry the genetics of God to form the Black Troops. Radiant Dawn, Leona, lead the team and train them combat techniques to fight against the invasion. Morgana, the Fallen Angel came to Earth to sow the seed of darkness and plot to destroy the Holy Kayle. Angel Yan was send to Earth, informing the invasion of Styx galaxy by Tao Tie. Earth has just become the battlefield for the war of different civilizations. As the disasters continue, the Black Troops will realize they are fighting more than what they are asked for.

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.