How many movies have Nobuyo Oyama and Otaka Hamana collaborated on?

They have worked on 10 movies together! Their first movie together was Doraemon: The Record of Nobita, Spaceblazer (1981) while their highest rated movie together was Doraemon: Nobita's Three Visionary Swordsmen (1994). They have not worked together since Doraemon: Nobita's Diary on the Creation of the World (1995). They are most known for their family films together.