How many movies have Eimei Yamamoto and Tamami Natsu collaborated on?

They have worked on 8 movies together! Their first movie together was The Bad Boss (1968) while their highest rated movie together was Brutal Tales of Chivalry 5: Man With The Karajishi Tattoo (1969). They have not worked together since Wolves of the City, Take Your Chance (1970). They are most known for their action films together.