How many movies have Eisaku Inoue and Kappei Yamaguchi collaborated on?

They have worked on 2 movies together! Their first movie together was One Piece: Giant Mecha Soldier of Karakuri Castle (2006) while their highest rated movie together was One Piece Episode of Merry: The Tale of One More Friend (2013). They have not worked together since One Piece Episode of Merry: The Tale of One More Friend (2013).