How many movies have Hiroaki Kawatsure and Yokoyama Kazuhiro collaborated on?

They have worked on 3 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: Ghost Hotel (2012). They are most known for their horror films together.