How many movies have Hiroki Iwasawa and Kei Sawada collaborated on?

They have worked on 8 movies together! Their first movie together was Honto Ni Atta! Noroi No Video 48 (2012) 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.