How many movies have Satoru Koyama and Yoshikazu Katō collaborated on?

They have worked on 2 movies together! Their first movie together was Aniki to ore III: Suki to ienakute (2006) while their highest rated movie together was Perverted Examination: Nurse Huge Breasts Torture (2012). They have not worked together since Perverted Examination: Nurse Huge Breasts Torture (2012).