How many movies have Ikue Otani and Ryuji Tsuzuku collaborated on?

They have worked on 3 movies together! Their first movie together was Detective Conan: Crossroad in the Ancient Capital (2003) while their highest rated movie together was Detective Conan: The Raven Chaser (2009). They have not worked together since Detective Conan: The Raven Chaser (2009). They are most known for their mystery films together.