How many movies have Shūji Kataoka and Yukikazu Morikubo collaborated on?

They have worked on 4 movies together! Their first movie together was Groper Train: Search for the Black Pearl (1984) while their highest rated movie together was Groper Train: One Minute Before Departure (1985). They have not worked together since Molester's Train: 1 Centimeter From The Wall (1990).