At the age of seventy, after years of consolidating his empire, the Great Lord Hidetora Ichimonji (Tatsuya Nakadai) decides to abdicate and divide his domain amongst his three sons. Taro (Akira Terao), the eldest, will rule. Jiro (Jinpachi Nezu), his second son, and Saburo (Daisuke Ryu) will take command of the Second and Third Castles but are expected to obey and support their elder brother. Saburo defies the pledge of obedience and is banished.

Farmers from a village exploited by bandits hire a veteran samurai for protection, who gathers six other samurai to join him.