The young Mikédi, nicknamed "Oni" (demon), is the son of a warlord. His goal is to become a Joru a warrior so powerful that the line of the Dragon Emperor to agree to take the husband and give him ink Shô, guaranteeing immortality. For this, his father gave him to master a lousy tramp, which proves to be an unparalleled master of the sword, the great ronin Miyamoto Musashi. But learning Mikédi will not be exactly what he expected. This is less a fantasy novel that wrote Thomas Day a learning novel in Japan dreamed tales centered around the enigmatic figure of Musashi, a true legend in Japan. How truly become a man, that is the question posed Musashi and author. This will be the reader to form an opinion after reading this short and dazzling novel, full of violence and fury contained by precise writing and great elegance.