It is almost certain that these two men, Imai Nobuo (left) and Watanabe Atsushi (right), had a direct hand in the assassination of Sakamoto Ryoma. Ryoma’s assassination is the subject of Part III of my forthcoming Samurai Assassins: “Dark Murder” and the Meiji Restoration, 1853-1868, to be published by McFarland in 2017.

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