How many movies have Isao Bitō and Tatsuo Umemiya acted in together?

They have worked on 4 movies together! Their first movie together was The Great Okinawa Yakuza War (1976) while their highest rated movie together was Japan's Don (1977). They have not worked together since Tokugawa Ichizoku no Houkai (1980). They are most known for their crime films together.