How many movies have Hiroshi Hashimoto and Ikue Otani collaborated on?

They have worked on 3 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: Chopper's Kingdom on the Island of Strange Animals (2002). They have not worked together since Zatch Bell! 101st Devil (2004). They are most known for their action films together.