Interesting account of Yasuke, the African Samurai. However, this is as much a "historical fiction," recounting of the fall of Oda Nobunaga, and some conjecture on the possible untold story of Yasuke. The authors are clearly trying to do a lot with a little.

While interesting, it was often hard to sift through historical fiction and actual fact. I would say you can get the brunt of the facts from a Google search, so only read if you are really interested in Japanese history.