Abnormal Blood

Original title: 日本暴行暗黒史 異常者の血

Directed by Kōji Wakamatsu

A detective investigating a serial rapist discovers that he and the perpetrator come from the same lineage of depraved individuals, a genealogy of violent and sexually perverse deviants that stretches through the Meiji, Taisho and Showa eras and can even be traced back to the Edo era.