How many movies have Ayumu Watanabe and Tsutomu Shibayama collaborated on?

They have worked on 4 movies together! Their first movie together was Doraemon: The Record of Nobita's Parallel Journey to the West (1988) and was their highest rated movie together. They have not worked together since Doraemon: Nobita and the Windmasters (2003). They are most known for their family films together.