How many movies have Hirohide Shikishima and Naoko Matsui collaborated on?

They have worked on 4 movies together! Their first movie together was Detective Conan: The Darkest Nightmare (2016) while their highest rated movie together was Detective Conan: Episode One - The Great Detective Turned Small (2016). They have not worked together since Detective Conan: The Scarlet Bullet (2021). They are most known for their mystery films together.