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An accident in his childhood, an encounter with an unknown man and the accidentally used bottle of potion doomed his life... After many years, Mu Ya's stable daily life suddenly came to an end one day. The girl "Ling" who suddenly transferred to his class that day changed his life. Ling was a member of the non-union freedom organization "zero" - a resistance organization that risked its life and fought alone to achieve "human peace" against evil forces in the world. Under the guidance of the spirit, he became related to zero. Later, due to the emergency, the super genome was activated, and the "Mark of the King" appeared on his right hand. Through the engraving, Mu Ya can extract a substance called "void (real thing)" from his body, and use it as a weapon to obtain the power of fighting - the black moon. At this point, the fate of Mu Ya and Ling began to change...