How many movies have Kanjūrō Arashi and Yōichi Numata acted in together?

They have worked on 12 movies together! Their first movie together was Emperor Meiji and the Great Russo-Japanese War (1957) while their highest rated movie together was Red Peony Gambler: Here to Kill You (1971). They have not worked together since Red Peony Gambler: Here to Kill You (1971).