How many movies have Kazuya Nakai 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 My Hero Academia: World Heroes' Mission (2021). They have not worked together since My Hero Academia: World Heroes' Mission (2021). They are most known for their adventure films together.