Dancers of Awa.

Jurobei, a kaisen tonya (wholesaler in port) in Awa, was wronged and killed on the day of the Dance Festival by the evil merchant & the chamberlin. His brother (Kazuo Hasegawa) vowed vengeance on the day of his brother's death. So every year the villains are worried during the Awa Dance Festival (which is part of the Obon festival), but nothing has ever happened, until seven years later...