Hattori Hanzo is a master ninja whose duty is to protect Tokugawa Ieyasu, the shogun who will eventually unite Japan into one nation.
Amazon.com description: Product Description
: If Art of War tactics and ninjitsu arts pique your interest, Path of the Assassin is the quasi historical samurai manga you've been waiting for! From the legendary comics creators Kazuo Koike and Goseki Kojima, of Lone Wolf and Cub fame comes the story of Japan's greatest shogun and his rise to power through the battles and intrigues of his late teens. Central to the story is a young ninja who must go to great lengths in order to secure victory for the boy who would become the shogun Tokugawa Ieyasu. Based loosely on fabled tales of the age, Path of the Assassin is an exciting and sexy series.