In a desolate, post-apocalyptic world gripped by perpetual winter, a small group of outcasts resides beneath the surface. The unsanitary living conditions have rendered sexual contact hazardous, making self-pleasure the norm. Consequently, a variety of rudimentary devices designed for this purpose have emerged. Within this grim setting, Czuperski, a vendor of these machines, strikes a bargain with Tania, a woman with a compulsive need for sexual gratification. She agrees to let him test new devices on her in return for pleasure. However, their arrangement soon spirals beyond their control.