How many movies have Akihiro Ugajin and Koji Shiraishi collaborated on?

They have worked on 3 movies together! Their first movie together was Senritsu Kaiki File Kowasugi! Preface: True Story of the Ghost of Yotsuya (2014) while their highest rated movie together was Senritsu Kaiki File Kowasugi! Final Chapter (2015). They have not worked together since Senritsu Kaiki File Kowasugi! Final Chapter (2015). They are most known for their horror films together.