Once, shards of evil called "Devil Splinters" were scattered across space, throwing the galaxy into chaos. At that time, Ultraman Z, a new member of the Inter Galactic Defense Force who sought out Ultraman Zero as a mentor, comes down to Earth while chasing the Ferocious Space Shark Genegarg. On Earth, the Anti-Monster Robot Force STORAGE is formed to face down the monsters that appear on a daily basis. In his first battle, Z merges with Haruki Natsukawa, a new pilot of STORAGE. Together, they rise up to protect the peace! However, behind the scenes, the parasitic lifeform Celebro has set a terrifying plot into motion...