So I got the book, for the most part it appears it follows the events of the Movie with a few changes to the journey but the facts and end is all the same.
Interested in a few parts below.
I noticed a few cameos in the book by Tokio as 9. Obviously I can't read Japanese so I have no idea of his involvement in the book. And in addition, unlike the movie where it ends with Adult Aura sitting in the atrium by herself, David's character shows up saying something.