LogFAQs > #970531906

If it's anything to keep in mind, then it may not be a perfect adaption of the game as a whole. Or maybe even go off on it's own tangents by Yoko Taro's will. I looked around a bit and saw that the anime staff working on it left these notes.

https://gamefaqs.gamespot.com/a/user_image/8/5/8/AATbylAAECgq.jpg
https://gamefaqs.gamespot.com/a/user_image/8/5/9/AATbylAAECgr.jpg
https://gamefaqs.gamespot.com/a/user_image/8/6/0/AATbylAAECgs.jpg

So Yoko Taro changed something in it. No clue how small or big said changes are, though knowing Yoko Taro it may not be outside the realm of possibility that this will indeed be changed to be some kind of unexpected happy side-story or alternate plot to the game's story. He's crazy enough to do something like that if he wants lol.