Yume dorei (1987)

Yuko, a beautiful married woman obsessed with SM delusions. Tachibana, the director at Tachibana Hospital where she is treated. Assistant Furuya. Nurse Megumi. Under the guise of reverse treatment for her, they gradually drag Yuko into a sensual SM hell. Yuko becomes a slave to the ecstasy and irresistible pleasure caused by her intense delusions, and she begins to live as a true masochist...