This is a hard book to review. It's a re-edited version of the interviews found in John Szczepaniak's three "Untold History of Japanese Game Developers" books, plus a few additional interviews.
While Szczepaniak's books were a valuable resource for researchers, containing very long interviews with Japanese developers, as books they were borderline unreadable. Unprofessional, poorly edited and poorly presented, they were basically a printed Word file with every single thing said during the interviews, including small-talk and awkward jokes.
Japansoft solves this by editing the three books down to a single, great-looking book, with the most interesting things that were said. Basically, it turned 50 hours of raw interviews into a 2 hour documentary.
That's great, but there's still a few problems: documentaries usually contextualize viewers, but here you won't get detailed introductions, or even game screenshots. If you don't already know about Japanese game studios like T&E Soft and games like The Black Onyx, you might need to pause to Google them. Also, the interviews are heavily edited and mixed together, so a researcher might still prefer the original books.
Not fit for casual reading, nor fit for research, it's an enthusiast's book. That's not a bad thing, just be aware of what you are getting into.
My only harsh criticism is regarding the photos & images. There are dozens of pages showing old pictures, game ads and posters, but they receive absolutely no context, translation or explanation. What's the point of showing photos of people but not telling who they are or where they worked at? Or showing a Japanese comic with no translation, explanations or date?
That aside, it's a great book for enthusiasts looking for some tales about the early days of Japanese game development.