Reborn as an Ultraman: Saving a Parallel World

"From now on, your name is Reta, Cecil Reta."

A Earth without any Giants of Light.

Reta was an ordinary person who had lost both parents in an accident. Then he unexpectedly transmigrated to another universe and gained the power to transform into a giant.

From then on, he kept traveling to other dimensional universes, saving timelines that had already been changed.

"What?! Dyna was taken out by his younger brother?"

"Seven's son was exiled from the Land of Light?!"

"Belial was the real hero?!"

"Wait, what?! Other people transmigrated here too?"