Haruki Natsukawa is a pilot for Global Allied Forces Japan's robot unit, STORAGE. As he fights day and night to keep the peace on Earth, a new Ultra Hero alights before him! That hero's name is Ultraman Z. He's a hot-blooded hero who introduces himself as the disciple of Ultraman Zero. In the face of the Ferocious Space Shark Genegarg's onslaught, the two imperiled heroes become one, and the story of Ultraman Z begins!