How many movies have Masayuki Takagi and Mayumi Tanaka collaborated on?

They have worked on 4 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 Film: Strong World (2009). They have not worked together since One Piece Film: GOLD (2016). They are most known for their adventure films together.