XX: Beautiful Prey (1996)

ＸＸ　美しき獲物

aka XX: Utsukushiki emono

This Japanese thriller finds a sexy policewoman becoming entangled in Japan's S&M underground while investigating a gruesome murder. Soon, her investigation has led her to a seductive sadist and his equally appealing masochist victim. Falling prey to her suspects' powerful allure, she struggles to extricate herself from an increasingly torrid affair to solve the mystery she set out to investigate.