How many movies have Akiko Yajima and Akira Ookuma collaborated on?

They have worked on 5 movies together! Their first movie together was Crayon Shin-chan: Storm-invoking Passion! The Adult Empire Strikes Back (2001) and was their highest rated movie together. They have not worked together since Crayon Shin-chan: Fast Asleep! Dreaming World Big Assault! (2016). They are most known for their animation films together.