How many movies have Jun Ikeda and Nobuyo Oyama collaborated on?

They have worked on 5 movies together! Their first movie together was Doraemon: Nobita and the Steel Troops (1986) while their highest rated movie together was Doraemon: The Record of Nobita's Parallel Journey to the West (1988). They have not worked together since Doraemon: Nobita and the Winged Braves (2001). They are most known for their science fiction films together.