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In the ancient times of the Sealing World, there were extremely destructive jade beasts that hindered the development and reproduction of human beings. During this period, there were many brave human beings who tried to kill these twelve jade beasts, but they all came back in vain. Faced with the dilemma of the living space being continuously compressed, the strong human beings continued to explore in the process of confronting the jade beast, and discovered a sealing technique that could be used to seal the jade beast. This sealing technique is called "Ley Vein·Sealing Technique". But it is not completely sealed. Every two hundred years or so, the jade beast's remaining spirit turns into twelve clones and returns to the world, but the jade beast will be limited to the scope of the sealing technique. Although the Jade Beast was sealed, the remaining spirits turned into twelve Jade Beasts and were sealed in the twelve corners of the seal. After more than 200 years, they returned to the world and appeared in Star City. The third and fourth Star Spirits tried their best, the third one died in battle, and the fourth one sealed "FireGreymon" on the newborn Nebula at the cost of his own life. Star City finally returned to peace. Nebula has been lonely and helpless since he was a child, and has a naughty nature that likes to play pranks and cause destruction. He is treated as a monster like a living "Tyrannosaurus" by the people. More than ten years later, the young Nebula is admitted to the Spirit Master School in Star City, where he meets Lin Yulihua. Lin, a self-proclaimed time traveler, has no spiritual energy in his body, and plans to use his mouth to escape from the strange young man who sealed the demon spirit.