A mysterious event shook the country and its people just 12 years prior. As time passed, the memory of the incident began to fade while peace reigned over the land. Kento Ishigami lives a quiet life in the Enastria Empire until a Kaiju suddenly attacks their peaceful home, changing everything. Kento becomes Ultraman Vortex to protect the Empire smiles.

Twelve years ago, two giant robots fought each other in the Kingdom of Rimgarde, causing massive destruction which create the evil robot name Zestumestu Symbiotic that caused commotion within the universe. Kento's fate as the brother of Zestumestu Symbiotic begins to unfold as he has to face off against his opponent Kaijus and Regalia Gear, as Ultraman Vortex.