In the early 18th-century, Lord Takumi-no-kami Asano, feuding with Lord Kira, tries to kill his opponent in the corridors of the Shogun's palace. The Shogun sentences Asano to seppuku and deprives the palace and lands from his clan, but does not punish Kira. Asano's vassals leave the land and his samurais become ronin and want to seek revenge against the Lord's dishonour. But their leader Kuranosuke Oishi seeks to restore the Asano clan with his brother Daigaku Asano. One year later, the Shogun refuses, and Oishi and 46 rōnin are out for revenge.

A period film about a peasant revolt in the region near Mount Fuji, occasioned by high officials' depriving the farmers of their water rights.