How many movies have Koji Shiraishi and Shigeo Ôsako collaborated on?

They have worked on 17 movies together! Their first movie together was Grotesque (2009) while their highest rated movie together was Senritsu Kaiki File Kowasugi! Final Chapter (2015). They have not worked together since Senritsu Kaiki World Kowasugi! (2023). They are most known for their horror films together.