How many movies have Minetaro Hirai and Tetsuo Yasumi collaborated on?

They have worked on 4 movies together! Their first movie together was The Cake Tree in the Ruins (2006) while their highest rated movie together was Crayon Shin-chan: Invoke a Storm! The Singing Buttocks Bomb (2007). They have not worked together since The Story of the Blue-Eyed Girl (2009). They are most known for their animation films together.