The tale of a renegade samurai fighting for revenge alongside his young son. Bloodshed is nonstop as they fight through an everlasting gob of enemies, aided by a variety of weapons. Shogun Assassin and Shogun Assassin 2 are not included as they are in fact American made compilations.
Official Shogunate executioner Ogami Itto has been framed for disloyalty to the Shogunate by the Yagyu clan, against whom he now is waging a one-man war, along with his infant son, Daigoro.
Ogami Itto battles a group of female ninja in the employ of the Yagyu clan and must eliminate a traitor who plans to sell his clan's secrets to the Shogunate.
Ogami Itto volunteers to be tortured by Yakuza in order to save a prostitute and is hired by their leader to kill an evil chamberlain.
Ogami Itto is hired to kill a tattooed female assassin and battles Retsudo, head of the Yagyu clan, and his son Gunbei.
Ogami Itto is challenged by a quintet of warriors, each armed with one fifth of Ogami's assassin fee and one fifth of the information he needs to complete his assignment.
With most of his family already dead at Ogami Itto's hands, Retsudo launches one final plot to destroy him, and when that fails, unleashes the fury of every remaining member of the Yagyu clan.
