How many movies have Takehiko Tamiya and Yoshinori Takazawa collaborated on?

They have worked on 12 movies together! Their first movie together was New Hotaru The Hyper Swindler 3 (2006) while their highest rated movie together was New Hotaru The Hyper Swindler 4 (2006). They have not worked together since Invisible Hentai Man: 60 Secretive Minutes (2014).