How many movies have Kōji Sekiyama and Tomoko Mayama acted in together?

They have worked on 4 movies together! Their first movie together was Killer's Mission (1969) while their highest rated movie together was Lone Wolf and Cub: Sword of Vengeance (1972). They have not worked together since Female Prisoner Scorpion: Beast Stable (1973). They are most known for their action films together.