How many movies have Ryotaro Makihara and Takaharu Ookuma collaborated on?

They have worked on 2 movies together! Their first movie together was Crayon Shin-chan: The Legend Called Buri Buri 3 Minutes Charge (2005) while their highest rated movie together was Summer Days with Coo (2007). They have not worked together since Summer Days with Coo (2007).