How many movies have Gentaro Iida and Hiroki Iwasawa collaborated on?

They have worked on 13 movies together! Their first movie together was Honto Ni Atta! Noroi No Video 42 (2011) and was their highest rated movie together. They have not worked together since Honto Ni Atta! Noroi No Video 55 (2013). They are most known for their horror films together.