This is gonna be long BUT okay.
I was expecting something like "HolyLand", but, unfortunally the answer is NOPE, take this shitty protagonist who conveniently find a upload on "Youtube" who pratically tell him "how to fight" against the rival of time.
Look I have a great suspension of disbelief, but, I HATE SO MUCH when some story is trying to be somehow realistic(aka. Beginning of Dr.Stone) and fail like shit, it's like the author is trying to insult my knowlegde every chapter.
So don't expect much from this...thing...probaly you could end up like it more than I didn't.