How many movies have Shûichi Isoda and Yoshihiro Nakamura collaborated on?

They have worked on 21 movies together! Their first movie together was Honto ni Atta! Noroi no Video 15 (2005) 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.