How many movies have Hiromi Kato and Shōji Sakai collaborated on?

They have worked on 12 movies together! Their first movie together was Lolita: Vibrator Torture (1987) while their highest rated movie together was Extracurricular Activity: Rape! (1989). They have not worked together since OL renzoku rape: Kyonyû musaboru (1990). They are most known for their horror films together.