How many movies have Emi Ishikawa and Mototsugu Watanabe collaborated on?

They have worked on 4 movies together! Their first movie together was Young Widow Mourning Convulsion (1990) while their highest rated movie together was Monzetsu OL: Ijô na Zengi (1991). They have not worked together since Monzetsu OL: Ijô na Zengi (1991).