Ultraman: What Do You Mean, You're a Dark Ultraman?

[No CP, no female lead + coming-of-age story + not the original universe] “A spacetime is facing total destruction.” “Darkness has invaded it, and the course of its world line is about to be altered. Naygus, you must save this spacetime.” At the call of a little girl and the sudden appearance of a spacetime rift, Naygus Ultraman, one of the Land of Light's latest class of outstanding... “problem” graduates, was whisked away to an unfamiliar spacetime. Taking the alias Guangyu, he lands on Earth and hasn't even managed to get a bite to eat before a string of bad news catches him completely off guard. What do you mean the Land of Light in this spacetime has disappeared? What do you mean the Ultramen who were once righteous have turned to darkness? He may have “problem” written all over him, but Guangyu is still a bona fide fish-head mom. Lost in a thick fog with no clear path ahead, he decides to uncover the truth behind the Land of Light's disappearance and recover the lights that have gone astray. But the road ahead is certain to be full of danger. Dark Tiga, evil Dyna, bloodthirsty Gaia... These heroes of old appear before Guangyu one after another. As for Guangyu, who has only just graduated, he can only say: “I'm completely screwed.” But no matter what kind of desperate situation the world faces, a vivid glimmer of hope will always bloom on this blackened land.