Hisayasu Sato is a Japanese exploitation film director He has worked prolifically in the pinku eiga genre He is known for his sledgehammer filmmaking style and using his exploitation career to tackle serious subjects like obsession alienation perversion and voyeurism He is famous for his guerilla shooting technique in which his actors appear on location in public and incorporate unknowing bystanders into the film Hisayasu Satos often violent but highly visual works utilised a multitude of multimedia devices to reflect upon issues such as the power of the gaze the dehumanising effects of technology and the loss of the individuals sense of self that accompanied Japans period of economic boom in the late 80s