A Fake Ultra Universe! I'm Just a Knockoff Tiga

[Ultraman spirit + not invincible + no female lead + everyone is a fake Ultraman + no out-of-character behavior + faithful to the original] (Sorry, I'm a new author, so my writing and storytelling skills may not be the best. I hope you'll bear with me. I'll keep learning and improving as I write, and I welcome readers' suggestions. I'm sure you'll enjoy the story, though.) Anyone can become light, but alone, no one can truly shine. Kazama Itsuki is an ordinary person who should have lived an ordinary life. But in his search for the truth behind Ultraman's disappearance, he willingly takes on the responsibility of protecting every universe. Faced with one powerful enemy after another, unable to protect the people he cares about, he falls further and further into despair. What will he do? … Kazama Itsuki is a childhood friend of the son of Daigo, Ultraman Tiga's human host. When Itsuki was seven, Ultraman Tiga saved him. His parents died in that battle, and Daigo took him in. A year after that, Ultraman Tiga suddenly disappeared, as if he had never existed at all. “I want to know why Ultraman disappeared. I want to know how the Land of Light is doing now. I want to tell everyone who remembers Ultraman that the light is still here.” What will happen on this unknown journey? …