How many movies have Ryusei Nakao and Tôru Satô collaborated on?

They have worked on 2 movies together! Their first movie together was Go! Anpanman: The Secret of Tsumiki Castle (1992) while their highest rated movie together was Go! Anpanman: The Palm of the Hand to the Sun (1998). They have not worked together since Go! Anpanman: The Palm of the Hand to the Sun (1998).