How many movies have Tadao Kanda and Yôichi Ôyama collaborated on?

They have worked on 2 movies together! Their first movie together was Moonshadow Ninja Scroll: Twenty-One Eyes (1963) while their highest rated movie together was The Yagyu Military Art: The One-Eyed Ninja (1963). They have not worked together since The Yagyu Military Art: The One-Eyed Ninja (1963).