How many movies have Akio Otsuka and Takashi Muratani collaborated on?

They have worked on 3 movies together! Their first movie together was One Piece: Baron Omatsuri and the Secret Island (2005) while their highest rated movie together was Sword of the Stranger (2007). They have not worked together since Hunter x Hunter: Phantom Rouge (2013). They are most known for their action films together.