How many movies have Aya Hirahara and Katsuji Oyamada collaborated on?

They have worked on 1 movie together! Their first movie together was Hentai shindorômu: Waisetsu hakuchûmu (2008) and was their highest rated movie together. They have not worked together since Hentai shindorômu: Waisetsu hakuchûmu (2008).