Ryôjoku! Hakui o hagu (1990)

Erotic film depicting the world of a nurse's lust with a unique touch of suspense. Nurse Risa is invited by her colleague Etsuko to go to a hotel in a white coat. A man called Saeki is waiting for her, and Risa is handcuffed to him, while Etsuko is humiliated and escapes. When they cannot find the key to the handcuffs, Saeki and Risa go out into the city, but a woman called Akiko, who mistakes Saeki for a real doctor, threatens them with a gun and takes them to a house. There they find an injured man called Nozawa...