Review Detail of Shiro_TheWiseOne in DxD: The Tale of Blood

Well. The author is amazing and has some good creativity so just read it at will. Some questions on it though that a lot will also probably ask since it's a "Wish Fullfiment + Harem". -> Does Main Character becomes the strongest? -> Will there be any Tragedy or Angst? -> Pandora, Hestia and other Waifus mentioned on the story will be at the Harem? -> OP Main Character?