How many movies have Kazuo Koito and Tatsurô Kashihara collaborated on?

They have worked on 2 movies together! Their first movie together was Junji Inagawa's Short Horror Cinema: Horror of a Shiver (2002) while their highest rated movie together was Junji Inagawa's Shivering Horror (2005). They have not worked together since Junji Inagawa's Shivering Horror (2005).