How many movies have Katsumi Tokoro and Mayumi Tanaka 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 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). They are most known for their animation films together.