Abnormal Blood (1967)
Original title: 日本暴行暗黒史 異常者の血
Abnormal Blood is a 1967 Japanese-language history movie directed by Kōji Wakamatsu, with a running time of 1h 15m. It stars Masayoshi Nogami, Akiko Yamao and Shōhei Yamamoto.
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.