XX: Beautiful Prey (1996)

ＸＸ　美しき獲物

aka 奇怪的你真让我心动 · Love Is Weird · Love is Weird · 奇怪的你真讓我心動 · Qi Guai De Ni Zhen Rang Wo Xin Dong

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.