Fifty-year-old Kasumi, driven by intense sexual desire, was dumped by her younger lover. Desperate, she pleads, "I'll do anything you say, just don't abandon me," and willingly becomes his personal love slave. The young man issues cruel commands, humiliating and tormenting her in public. Initially bewildered by the shame of outdoor degradation, Kasumi gradually awakens to her own depraved lust. With a blissful expression, she bathes in urine and miserably reaches climax during sex in the open. This marks the moment she, a woman past fifty, discovers her true masochistic nature for the first time.