This is a book highlighting Mizushima Oonari's artwork/CG for the game [Kuro no Kyoushitsu], paired with extra illustrations that are drawn by Oonari, Kagami, Kanami, and Kurono Tomoaki. Not sure why people instantly associate anything from Bishop involves Kagami -- you can even see this in the gallery tags where the actual fucking artist for the majority of this book has less tag votes.
I'm fortunate enough to actually own this book and I can confirm that this gallery is complete. Unlike the previous book's gallery that focuses on Kagami's work with Bishop, which was missing all the 2 page spreads, this one has every page scanned.