How many movies have Haruyasu Ito and Shun Nakahara collaborated on?

They have worked on 4 movies together! Their first movie together was Wakazuma kannō kurabu: zetchō yūgi (1980) while their highest rated movie together was Lady Caligula in Tokyo (1981). They have not worked together since Seiko's Juicy Thighs: Public Bath Beauty (1982).