How many movies have Hiroki Iwasawa and Shûichi Isoda collaborated on?

They have worked on 9 movies together! Their first movie together was Honto ni Atta! Noroi no Video 25 (2007) and was their highest rated movie together. They have not worked together since Honto Ni Atta! Noroi No Video 46 (2012). They are most known for their horror films together.