This could have been a great book it weren't so biased.
On the plus side it is must be noted that this book is a great introduction of Japanese politics, including domestic, foreign and security policy put in their historical context. Thus it is great read for beginners as well as experts on Japan and its politics and state. It is also a great book to understand the Abe phenomenon, because the developments since his reelections can only be understood knowing the roots in Japan's history and society. It gives good and short analysis on hot issues like Abenomics, constitutional reform etc.
On the negative side: this book is very biased, this is the leftist liberal narrative of Japan, Abe and Japanese politics. The book overuses labels (cliches) like revisionist, far-right, right radical, nationalist and the likes. In the view of the authors Abe (and Japan) is the evil, ad everything Abe thinks or does is essentially evil and bad. I don't think things should be discussed in such a black-and-white way. Though the underlying and primary message of the book the politics in Japan has significantly shifted to the right, is definitely true and this argument is very well supported by facts.
The bibliography is very thin, most of the references are from The Japan Times, which is a good daily paper, but doesn't deserve that much emphasis in a book like this. Among the Japanese language daily papers the book only quotes from Asahi and Mainichi, the two left leaning dailies and not a word of Yomiuri, which is the biggest, not to speak of Sankei or Nikkei.
The book can't avoid falling into the trap of Western liberals telling other countries how to run things, and by reading the book the impression can be that Japan is the bad guy in the region intentionally poisoning external relations by following a supposedly nationalist agenda - the truth is far from that. The authors visibly have problems with educational policy of the LDP and Abe, but it is difficult to understand why singing the national anthem or raising the Japanese flag in a Japanese school are overly nationalist things. The same applies for example for history textbooks. The authors criticise the ministry of education to whitewash prewar history in textbooks to flare up tensions with neighbouring countries but we don't know what they teach about history in Chinese, Korean or DPRK textbooks.
To sum it up: it could have been one of the best books I have read on Japanese politics, but the biased narrative diminishes the value of this book.