How many movies have Katsutoshi Akiyama and Takuzō Kawatani acted in together?

They have worked on 11 movies together! Their first movie together was The Viper Brothers (1971) while their highest rated movie together was Battles Without Honor and Humanity: Deadly Fight in Hiroshima (1973). They have not worked together since Yakuza Graveyard (1976). They are most known for their crime films together.