How many movies have Kōji Sekiyama and Takashi Hio acted in together?

They have worked on 20 movies together! Their first movie together was The Second Bullet is Marked (1960) while their highest rated movie together was Japan Organized Crime Boss (1969). They have not worked together since Shinjuku's Number One Drunk-Killer Tetsu (1977). They are most known for their crime films together.