How many movies have Ikue Otani and Tsutomu Kawahigashi collaborated on?

They have worked on 5 movies together! Their first movie together was Pokémon Heroes (2002) while their highest rated movie together was One Piece: Baron Omatsuri and the Secret Island (2005). They have not worked together since Detective Conan: The Scarlet Bullet (2021). They are most known for their action films together.