How many movies have Keiichi Yamada and Naofumi Yamamoto acted in together?

They have worked on 19 movies together! Their first movie together was NJPW Wrestle Kingdom 1 (2007) while their highest rated movie together was Becoming the Best in the World: Bryan Danielson (2013). They have not worked together since NJPW Dominion in Osaka-jo Hall (2020).