How many movies have Yokoyama Kazuhiro and Yuko Aramaki collaborated on?

They have worked on 4 movies together! Their first movie together was Spine-Chilling Short Stories Kowabana (2011) and was their highest rated movie together. They have not worked together since Spine-Chilling Short Stories Kowabana: Nightmare Weather (2012). They are most known for their horror films together.