On the mysterious planet D60, the birthplace of the legendary space martial art, Cosmo Beast Style, which harnesses the power of contracted guardians of this planet, the Cosmo Beasts. Under the guidance of the grandmaster, Master Alude, Cosmo Beast Style fighters trained rigorously.

One day, a young man named Ultraman Regulos washed up on the shore of D60, having lost all memories except for his name. Recognizing his talent, Master Alude took Regulos under his wing and began to teach him the legendary Cosmo Beast Style, said to be the strongest martial art in the universe… This is the story of his fierce battles.