How many movies have Kappei Yamaguchi and Noboru Koizumi collaborated on?

They have worked on 3 movies together! Their first movie together was One Piece: Dead End Adventure (2003) while their highest rated movie together was One Piece Special: Protect! The Last Great Stage (2003). They have not worked together since One Piece Special: Protect! The Last Great Stage (2003). They are most known for their animation films together.