On the surface, this book could be said to be aimed at a specialist market, as it centres on Japanese students studying at Cambridge in the days of the British Empire. This was with the ironic view of the prevention of Western Imperialism stretching to their shores, and the adapting and embracing of many inherent values to strengthen their own empire. So, yes, it's specialist in this sense, but the way the introduction and the contents have been written and explained (with perhaps traditional Japanese efficiency), makes it a very interesting and very informative read for all who can show at least a little concentration of something 'a little on the heavy side'.
As a bonus, because of the data-intensive contents, interesting snippets such as the different reigns and even much of the Japanese Calendar is here. Ultimately, it may not be for you, but you will be impressed by an absolutely staggering start, devoid of over-heavy grammar which accompanies many similar tomes. Very, very well done, Ian Ruxton.