How many movies have Hiroki Iwasawa and Yoshihiro Nakamura collaborated on?

They have worked on 28 movies together! Their first movie together was Honto ni Atta! Noroi no Video 25 (2007) while their highest rated movie together was Kidan Piece of Darkness (2016). They have not worked together since Honto ni Atta! Noroi No Video: BEST OF BEST (2020). They are most known for their horror films together.