How many movies have Mari Mashiba and Mitsuru Hongo collaborated on?

They have worked on 4 movies together! Their first movie together was Crayon Shin-chan: Action Mask vs. Leotard Devil (1993) while their highest rated movie together was Crayon Shin-chan: Invoke a Super Storm! The Hero of Kinpoko (2008). They have not worked together since Crayon Shin-chan: Invoke a Super Storm! The Hero of Kinpoko (2008). They are most known for their animation films together.