How many movies have Yuka Koichi and Yuu Kato collaborated on?

They have worked on 3 movies together! Their first movie together was One Piece Film: Strong World (2009) while their highest rated movie together was Space Battleship Yamato 2199: Odyssey of the Celestial Ark (2014). They have not worked together since Space Battleship Yamato 2199: Odyssey of the Celestial Ark (2014). They are most known for their animation films together.