How many movies have Hiroki Yokoe and Katsuji Oyamada collaborated on?

They have worked on 9 movies together! Their first movie together was SEX sôsakyoku: Kuwaekomi file (2006) while their highest rated movie together was Saimin ecstasy: Nozokareta seiheiki (2007). They have not worked together since Zetsuron rônen: Namenebaru shita (2008).