The second book of Gi(a)rlish Number isn't that much different than the first one, with Chitose's point of view makes me feel like she's a scatterbrain and Gojo's point of view is giving us the sneak peak into the anime industry.
The only thing that makes the second book different than the first book is the second book has more illustrations than the first book. I don't see that as a bad thing since it doesn't hurt to look at these illustrations once in awhile.