The full title of this book is I, the Parallel Universe of a Chaotic World, Observer, the Pinnacle of Saviors and Eldritch God Hunter, Occasionally Destroying Other Universes Out of Humanitarianism, But Definitely Not a Tyrant or Anything
Synopsis:
The past is a branch whose course has already been confirmed, while the future is a tree of infinitely spreading branches. As long as something has not become an absolute fact of the past, everything remains within my grasp.
Take action in the present, and set your sights on the future.
If these eyes can see the possibilities of an infinite future, then these hands can decide the development of the world and the cause and effect of all things.
So...
Behold the Sovereign of the Future!
This book has way too many elements (not referring to the protagonist in particular), including but not limited to a big shot getting back in shape, a dimensional forum, super robots, a charlatan, the reincarnation of a somewhat hysterical fantasy powerhouse into a world of anime, a Grand Savior (allegedly), and cyber-Cthulhu (in two senses of the term, representing something extremely baffling).