The Viper Brothers: 18 Extortion Threats (1972)

Part 4 in a long running (8+1 films) action/comedy/melodrama series about a pair of short tempered, amoral, but not evil chinpira (Bunta Sugawara and Tamio Kawachi) thinking too big of themselves. Sugawara tries to overcome a traumatic experience of getting in bed blindfolded with a girl who turned out to be an old granny. Later he and Kawaji try to settle down in a neighbourhood harassed by businessman yakuza Bin Amatsu.