Ling Su, an ordinary college student and an avid tokusatsu fan, accidentally gained the power to transform into Ultraman Zero during a sudden monster disaster. He is no longer the audience shouting for heroes in front of the screen, but has to face huge monsters and unknown enemies in person. However, this power that fell from the sky brought him not only glory, but also fear, confusion and responsibility. While hiding his identity, he must learn how to control this destructive power, face the suspicion and temptation from the human defense force, and under the guidance of Zero's remaining consciousness, step by step grow from an ordinary person to a true giant of light. This is a trial about a mortal hero, and his limit has just begun.
