How many movies have Shinichi Shimano and Shinji Oosawa collaborated on?

They have worked on 3 movies together! Their first movie together was Honto ni Atta Yami Ura Douga 4 (2017) and was their highest rated movie together. They have not worked together since Honto ni Atta Yami Ura Douga 6 (2017). They are most known for their horror films together.