Kigeki: Otoko no nakidokoro (1973)

A straight-laced police officer is reassigned to the vice squad tasked with cracking down on underground pornography rings. While investigating a blue film operation, he becomes involved with a charismatic stripper who may hold the key to the case. As the investigation deepens, the officer finds his personal life and sense of masculinity unexpectedly transformed, blurring the line between duty and desire.