How many movies have Masami Otsuka and Reiko Ikeda collaborated on?

They have worked on 7 movies together! Their first movie together was Doraemon: The New Record of Nobita's Spaceblazer (2009) while their highest rated movie together was Doraemon: Nobita and the New Steel Troops: Winged Angels (2011). They have not worked together since Doraemon: Nobita's Treasure Island (2018). They are most known for their family films together.