If you launch the game and get a black screen but can hear the sound then do I have the guide for you.

First thing you need to do is find the "Config.ini" file

It should be located in
(C:\Users\ (User Name Here) \AppData\Local\BANDAI NAMCO Games\GOD EATER 2 RAGE BURST)

Open the file with note pad and scroll down to the bottom where it says "[GFX]" and find where it says "Fullscreen=1"

Now here is where you have 2 options, if you want to play the game in windowed mode you will replace the 1 with a 0

If you want to play the game in Fullscreen replace the 1 with a 2.

launch the game and you should see the opening and be able to play the game.

If you need any help just post the trouble you are having in the comments and I will try to help.