How many movies have Ikue Otani and Takayuki Kitagawa collaborated on?

They have worked on 4 movies together! Their first movie together was Detective Conan: The Lost Ship in the Sky (2010) while their highest rated movie together was One Piece Film: Z (2012). They have not worked together since Pokémon the Movie: Genesect and the Legend Awakened (2013). They are most known for their animation films together.