How many movies have Hiromi Ishigami and Kappei Yamaguchi collaborated on?

They have worked on 6 movies together! Their first movie together was One Piece: Episode of Chopper Plus: Bloom in the Winter, Miracle Cherry Blossom (2008) while their highest rated movie together was One Piece: Stampede (2019). They have not worked together since One Piece: Stampede (2019). They are most known for their adventure films together.