How many movies have Reiko Oshida and Toshiaki Tsushima collaborated on?

They have worked on 4 movies together! Their first movie together was Delinquent Girl Boss: Blossoming Night Dreams (1970) while their highest rated movie together was Delinquent Girl Boss: Ballad of Yokohama Hoods (1971). They have not worked together since Delinquent Girl Boss: Worthless to Confess (1971). They are most known for their crime films together.