How many movies have Ayako Karatani and Ikue Otani collaborated on?

They have worked on 4 movies together! Their first movie together was Detective Conan: Full Score of Fear (2008) while their highest rated movie together was Detective Conan: The Raven Chaser (2009). They have not worked together since Detective Conan: Private Eye in the Distant Sea (2013). They are most known for their animation films together.