How many movies have Ikue Otani and Yuki Hayashi collaborated on?

They have worked on 6 movies together! Their first movie together was One Piece: The Desert Princess and the Pirates: Adventure in Alabasta (2007) while their highest rated movie together was Heartcatch Precure! Movie: Fashion Show in the City of Flowers!? (2010). They have not worked together since One Piece Film: GOLD (2016). They are most known for their adventure films together.