How many movies have Kôji Yamazaki and Mototsugu Watanabe collaborated on?

They have worked on 10 movies together! Their first movie together was Fluffy Sexy Boys (2001) while their highest rated movie together was The Succulent Succubus (2011). They have not worked together since Juku, gyaru, hakusho: Gokuraku jin ô botchi (2016).