How many movies have Naomi Kawai and Osamu Iwamura collaborated on?

They have worked on 20 movies together! Their first movie together was Honto Ni Atta! Noroi No Video 58 (2014) while their highest rated movie together was Honto Ni Atta! Noroi No Video 63 (2015). They have not worked together since Honto Ni Atta! Noroi No Video 89 (2020). They are most known for their horror films together.