How many movies have Hajime Okayasu and Minetaro Hirai collaborated on?

They have worked on 5 movies together! Their first movie together was Doraemon: Nobita's Diary on the Creation of the World (1995) while their highest rated movie together was Doraemon: Nobita and the Galaxy Super-express (1996). They have not worked together since Kiku and the Wolf (2008). They are most known for their animation films together.