Cuarta entrega de la serie de adaptaciones al cine de imágen real del famoso manga escrito por Kazuo Koike y dibujado por Goseki Kojima. Narra las aventuras de un ronin que deambula por el Japón del shogunato Tokugawa acompañado de un niño. En esta ocasión Ogami es contratado para acabar con una asesina tatuada, mientras Gunbei Yagyu, un antiguo enemigo que ha encontrado a Daigoro por casualidad, le desafía en duelo.
Ambientado en la época Meiji, nos presenta una fuerte mujer independiente, llamada Oryu, más conocida como La Peonía Roja, que decide salir en busca del asesino de su padre, un jefe de un pequeño pero respetado clan yakuza, para vengarse, encontrándose por medio a diferentes e interesantes personajes, y llegando y todo a intentar recuperar el antiguo poder del clan de su padre.
In the fourth installment, Musashi's potentially greatest opponent Kojiro jumps in and out of the story at the oddest and most coincidental moments. As his great love Otsu has succumbed to madness. Musashi then sets off to beat the functionaries of a treacherous clan in an arranged duel. 73 against one. Boastful Kojiro watches, secure in the knowledge that only he is a worthy opponent.
A sadistic Daimyo (feudal lord) rapes a woman and murders both her and her husband, but even when one of his own vassals commits suicide to bring attention to the crime, the matter is quickly hushed up. Not only will there be no punishment, but because the Daimyo is the Shogun's younger brother, he will soon be appointed to a high political position from which he could wreak even more havoc. Convinced that the fate of the Shogunate hangs in the balance, a plot is hatched to assassinate the Daimyo. The two most brilliant strategic minds of their generation find themselves pitted against each other; one is tasked to defend a man he despises, and has a small army at his disposal. The other is given a suicide mission, and has 12 brave men. They are the 13 Assassins.
Friendship between good samurais and aborigines in Hokkaido.
Magistrate Kinshiro fights with a group of villains plotting the assassination of the Shogun in Edo.
