The title is "Becoming an Ultraman Warrior Means There’s No Turning Back"
I picked the title at random, then found out I couldn't change it after signing the contract…
"Continuation of the Decker and Trigger universe + original Ultraman + the spirit of Ultraman + realism + ensemble cast + not overpowered + coming of age + tragedy"
(Not a mindless power fantasy. A tragic coming-of-age story. The early chapters are fairly bleak, and he becomes an Ultraman in Chapter 18. I believe it captures the spirit of Ultraman.)
(The protagonist is driven by hatred and forced to merge with a giant. He must save the world at the cost of having his body and mind taken over. Can he change the fate that was already decided and find redemption of his own?)
Phantom: Merge with me, and you can stand against the rampaging monsters.
Yan Qingfeng: No. Don't think you can trick me into risking my life to work for you.
Phantom: An evil force on Earth is watching from the shadows. Your companions and everyone you care about will die.
Phantom: Will you agree to become one with me, trading your life for a chance at victory?
Yan Qingfeng: Whatever. My life isn't worth much anyway. I'll bet on not ending up with that predetermined fate. Win or lose, I'll accept it…
“The moment you make your choice, there's already no turning back.”
A new Ultraman warrior is born. Is he really the savior of the world?
With the help of a mysterious person, he gradually becomes a dependable warrior.
As the journey goes on, Yan Qingfeng begins to realize that someone seems to be pulling his strings. An even darker plot awaits him.
Uh, get more experience.