How many movies have Keisuke Morishita and Masami Otsuka collaborated on?

They have worked on 3 movies together! Their first movie together was Doraemon: The Record of Nobita, Spaceblazer (1981) while their highest rated movie together was Doraemon: Nobita and the Castle of the Undersea Devil (1983). They have not worked together since Doraemon: Nobita and the Castle of the Undersea Devil (1983). They are most known for their fantasy films together.