How many movies have Teiyu Ichiryusai and Yoshito Usui collaborated on?

They have worked on 18 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: The Adult Empire Strikes Back (2001). They have not worked together since Crayon Shin-chan the Movie: Our Dinosaur Diary (2024). They are most known for their animation films together.