How many movies have Tetsuo Hirakawa and Tetsuro Kaku collaborated on?

They have worked on 4 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). They are most known for their animation films together.