The art book is next-level good.
It's hard for me to pick my favorite part of the game because so much of the second half of the game hits like a truck. I also love how the protagonist of the game
isn't even truly introduced until that point - he's not even on the Cast list on the game's website.
In Door 4 (the
fake
story of Michel and the White-Haired Girl), did you check the 'show previous text' log at any point?
Black Turtle
did a pretty good job.