How many movies have Ikue Otani and Kazuya Nakai acted in together?

They have worked on 23 movies together! Their first movie together was Luffy's Fall! The Unexplored Region - Grand Adventure in the Ocean's Navel (2000) while their highest rated movie together was One Piece: Adventure of Nebulandia (2015). They have not worked together since One Piece Film Red (2022). They are most known for their animation films together.