How many movies have Akinori Nagaoka and Ryusei Nakao collaborated on?

They have worked on 11 movies together! Their first movie together was Go! Anpanman: The Shining Star's Tear (1989) while their highest rated movie together was Go! Anpanman: The Palm of the Hand to the Sun (1998). They have not worked together since Soreike! Anpanman: Donburimantorio no Otsukai (2011). They are most known for their animation films together.