How many movies have Rei Sakuma and Ryusei Nakao acted in together?

They have worked on 17 movies together! Their first movie together was Go! Anpanman: The Shining Star's Tear (1989) while their highest rated movie together was Go! Anpanman: Baikinman's Counterattack (1990). They have not worked together since Go! Anpanman: Roboly and the Warming Present (2023). They are most known for their animation films together.