How many movies have Mikine Kuwahara and Yoshihiko Umakoshi collaborated on?

They have worked on 2 movies together! Their first movie together was One Piece: Baron Omatsuri and the Secret Island (2005) while their highest rated movie together was Zatch Bell! Attack of Mechavulcan (2005). They have not worked together since Zatch Bell! Attack of Mechavulcan (2005).