How many movies have Ikue Otani and Ryota Morikawa collaborated on?

They have worked on 4 movies together! Their first movie together was Lupin the Third vs. Detective Conan: The Movie (2013) while their highest rated movie together was Detective Conan: Episode One - The Great Detective Turned Small (2016). They have not worked together since Case Closed: Zero the Enforcer (2018). They are most known for their animation films together.