[Period covered: 1616] On May 8th, 1615 the summer campaign of Osaka has reached the climax. This film takes place immediately following 'Ninja 4: Mist Saizo, Last of The Ninja'. Staying one step ahead of the Shogun’s forces, “Mist” Saizo tries to save the Sanada Clan, and avenge the death of his lord by assassinating the first Tokugawa Shogun. Following the first four films in this remarkable series, more previously unknown Ninja skills are shown to the world for the first time. The action heats up as Saizo single-handedly attacks the Shogun’s Palace!