How many movies have Ichirô Nakayama and Keisuke Toyoshima collaborated on?

They have worked on 6 movies together! Their first movie together was Kaidan Shin Mimibukuro: Dai Ichi Ya (2003) while their highest rated movie together was Kaidan Shin Mimibukuro Nagurikomi! (2008). They have not worked together since Kaidan Shin Mimibukuro Nagurikomi! 2 (2009). They are most known for their horror films together.