Following the destruction of Ultraman Belial in Ultraman Geed, the Devil Splinters were scattered and turn monsters into berserker, causing chaos throughout the universes. While the Ultra Heroes fight to restore peace to the galaxy, Celebro uses these items in its despicable schemes to destroy planets one by one. And now, that evil being approaches the "Land of Light." In its way stands the gallant Ultraman Zero and his disciple, Ultraman Z. At the end of a fierce battle, Z chases Genegarg alone, making his way towards Earth. Meanwhile, on Earth, a defense force to combat routine monster appearances, the anti-monster robot force STORAGE, is formed and joined by the hot-blooded youth Haruki Natsukawa. When a monster from space invades Earth, Z and Haruki have their fateful encounter while Celebro started to plan his schemes.