How many movies have Keijirô Hara and Koji Shiraishi collaborated on?

They have worked on 7 movies together! Their first movie together was Senritsu Kaiki File Kowasugi! File 02: Shivering Ghost (2012) while their highest rated movie together was Senritsu Kaiki File Kowasugi! Final Chapter (2015). They have not worked together since Senritsu Kaiki File Super Kowa Too! Fear Adventure: Kokkuri-san (2015). They are most known for their horror films together.