Path of the Assassin

Path of the Assassin (半蔵の門, Hanzō no Mon) is a gekiga manga created by the writer Kazuo Koike and the artist Goseki Kojima and published in Weekly Gendai magazine (Kodansha).

Plot
Path of the Assassin, called Hanzo no Mon in Japan, is the story of Hattori Hanzo, the fabled master ninja whose duty was to protect Tokugawa Ieyasu, the shogun who would unite Japan into one great nation. But before he could do that, he had to grow up and learn how to love the ladies! As the secret caretaker of such an influential future leader, not only does Hanzo use vast and varied ninja talents, but in living closely with Ieyasu, he forms a close friendship with the young shogun. The quality of their relationship is unforgettably crystallized by Hanzo's fulfillment of a challenging but enticing task Ieyasu sets him: to demonstrate how to make love to a woman, which neither youngster has ever done. Hanzo succeeds at obliging his master and winning himself a woman whom he pleases, but anticipating that he won't be able to serve both master and wife, Hattori turns away the young woman he won while Ieyasu walks a tactical tightrope between the factions contending for rule—one led by his de facto father, the other by his older brother while Hanzo meets Tsukumo, the female ninja who will be his wife. Ieyasu wins his first battle when his foster father is killed, which simplifies Ieyasu's next choice of an ally, while meanwhile Hanzo and Tsukumo oppose the marriage because two families' lords are potential rivals. Later, Hanzo rescues Ieyasu's wife and children from a sadistic warlord, precipitating an attempt on Hanzo's life and, oddly, estrangement between him and Ieyasu when Hanzo offends Ieyasu's wife. Hanzo's father-in-law is attacked by another ninja who had previously attacked Hanzo, and the dying man charges Hanzo and Tsukumo to avenge him. Ieyasu, awaiting Hanzo's return from his voluntary exile, makes a mistake by attempting to collect rice from Buddhist-monk vassals belonging to a sect that spurns feudal obligations and provokes an uprising that may be taken advantage of by his rivals. Hanzo learns of the situation and with Tsukumo begins a series of subterfuges and impersonations which culminates in him obtaining a secret document that enables Ieyasu to quell the uprising.