How many movies have Ikue Otani and Kenichi Hamazaki collaborated on?

They have worked on 2 movies together! Their first movie together was Martian Successor Nadesico: The Motion Picture - Prince of Darkness (1998) 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).