I've read two outstanding books over the last week: Tokyo Vice by Jake Adelstein and Last Train From Hiroshima by Charles Pellegrino. The first is relevant to the Mizushō background because it has a lot of stuff about the water trade and Yakuza involvement in it. There's even a chapter called “Welcome to Kabukichō.” The second book is a tougher read, though it is beautifully written. Last Train has been optioned by James Cameron, so we might see a spectacularly gruesome recreation of the Hiroshima and Nagasaki bombings.