How many movies have Akemi Ohsawa and Naoki Youyama collaborated on?

They have worked on 1 movie together! Their first movie together was Honto ni Atta: Toko Yami Eizo - DEEP 4 (2015) and was their highest rated movie together. They have not worked together since Honto ni Atta: Toko Yami Eizo - DEEP 4 (2015).