Samurai Executioner(1972)

In a prison world, there are few good stories, and this is the world of Kubikiri Asa, the beheader and master samurai under the Shogun. It's a world full of vengeance, greed, and violence. A world of depravity and sin. One man can set things straight if he can keep his wits. This is a story of extreme proportions, of sword study thick in tradition and with grim purpose, of blood rivers, agonizing screams, bondage, torture, and the evil prevalent in human failure. Drafted by the confirmed masters of the international medium of manga, Samurai Executioner is a shocking combination of darkness and fire, fine lines, and a fine man in the face of human decline.

(Source: Dark Horse)