How many movies have Fujiko F. Fujio and Masayuki Sekine collaborated on?

They have worked on 3 movies together! Their first movie together was Doraemon: Nobita's the Legend of the Sun King (2000) while their highest rated movie together was Doraemon: Nobita and the Winged Braves (2001). They have not worked together since Doraemon: Nobita's Treasure Island (2018). They are most known for their family films together.