This is my absolute favorite book on the Phantasy Star series. Released only in Japan (obvs), the book is solely focused on the original quadrilogy of games.
As soon as you open the book, there is a fantastic fold out “poster” featuring fan favorite characters.
The features start pretty conventional, with an overview of each of the 8 and 16-bit games.
From there, the book moves into more eclectic fare: strategy guides, soundtracks, commercials, an interview with the Phantasy Star IV team, and original art (some of which I had never seen before).
I purchased the book from Amazon Japan, but as of this post, temporarily unavailable.