How many movies have Koji Endo and Naoto Muraishi collaborated on?

They have worked on 4 movies together! Their first movie together was Molester Diary: A Man Who Kept Stroking Ass 3 (1996) while their highest rated movie together was Diary of Beloved Wife: Saucepot (2006). They have not worked together since Diary of Beloved Wife: Saucepot (2006).