How many movies have Hajime Okayasu and Wakana Yoko collaborated on?

They have worked on 2 movies together! Their first movie together was The Tale of the Ginormous Whale That Fell in Love with a Little Submarine (2004) while their highest rated movie together was Crayon Shin-chan: Invoke a Storm! The Singing Buttocks Bomb (2007). They have not worked together since Crayon Shin-chan: Invoke a Storm! The Singing Buttocks Bomb (2007).