In the Twelve-World, the mysterious land in an unknown dimension, the humans, monsters and spirits coexist in harmony for a long time. All the lives are protected by the Princess of the Needle Tower in the Zero World. All of a sudden, the balance of the Twelve World is crumbled. The Princess of the Needle Tower is confined to sleep. After losing the protection of the Princess, the monsters are released from the chain of life and become uncontrollable. They begin to attack the humans...

The troubleshooters called the Great Children dealing with the incidents involving the monsters are the only ones who can restore the harmony and balance of the Twelve World. Spaak is the best of the group of the Great Children and the center of children's admiration. He learns that the Zero World was invaded. On the way to the Needle Tower, he meets an incredible boy, Bucky. Young and ambitious Bucky wants to be the strongest man and conquer the world. Spaak feels something special in Bucky and chooses the boy to be his successor. So, Bucky sets out for his quest to be the best Great child of the world. While going ahead recklessly, Bucky learns that the monsters are controlled by an unknown power from another dimension. He meets Kai, Pinky and other fellow Great Children and continues to travel to the Needle Tower with them. 
(Source: Enoki Films)

This history happens at a place called "Parallel Planet" located above the sky and down the sea. This planet is divided in twelve worlds, in such way that if it seems like a clock. In the center of this clock, exists the "Needle tower", A place where the time doesn't run, The World Zero. 
In each "world" there is a Great Child (or G.C.), that is something like the guardian of that world. The Great Child is always accompanied by a spirit, which is an explosive, espheric side-kick that helps to defeat the Monster Troublemakers. 
Bucky, the protagonist of the history, is a normal boy that lives in the first world. He lives with a single and humble ambition: to dominate the world (in the sense of the whole planet). He is very certain and he would certainly die to reach his dream. 
One day he meets with Spark, the Great Child of Primas (World One). Spark is known as the strongest Great Child of all of the worlds, and he is on a successor's search. After finding Bucky and talking a little with him, Spark, without apparent reason, chooses Bucky as his successor. Bucky has just become a Great Child and to wins the company of Jibaki, the spirit of the first world. 
Since then, Bucky comes out to travel the twelve worlds and to accomplish his dream of dominating the world, with their friends (or like he would say, slaves) that he finds in the world.

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