How many movies have Minetaro Hirai and Nobuyo Oyama collaborated on?

They have worked on 4 movies together! Their first movie together was Doraemon: Nobita and the Kingdom of Clouds (1992) while their highest rated movie together was Doraemon: Nobita and the Galaxy Super-express (1996). They have not worked together since Doraemon: Nobita and the Galaxy Super-express (1996). They are most known for their family films together.