How many movies have Masakatsu Sasaki and Masami Otsuka 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 Doraemon: Nobita's Dinosaur (2006). They have not worked together since Doraemon: Nobita and the Space Heroes (2015). They are most known for their animation films together.