How many movies have Natsuko Kitani and Shûichi Isoda collaborated on?

They have worked on 21 movies together! Their first movie together was Onmyoji Real Record! Hyakuki Annihilation (2003) and was their highest rated movie together. They have not worked together since Honto Ni Atta! Noroi No Video 35 (2009). They are most known for their horror films together.