How many movies have Hajime Okayasu and Sachi Matsumoto collaborated on?

They have worked on 2 movies together! Their first movie together was The Cake Tree in the Ruins (2006) while their highest rated movie together was Doraemon: Nobita's New Great Adventure Into the Underworld - The Seven Magic Users (2007). They have not worked together since Doraemon: Nobita's New Great Adventure Into the Underworld - The Seven Magic Users (2007).