In a small metalworking factory town filled with the scent of metal and oil, factory owner Rin Aoki struggles daily to keep operations running while the workers' pent-up desires spiral into madness and pleasure. Determined to save the factory by using her own body, she faces constant frustration from lazy, unreliable men. Amid the factory's greasy, sweat-soaked atmosphere, lust erupts uncontrollably. Rin is seduced by clients, dragged into forced threesomes, assaulted with tools in dark corners of the active workshop, and subjected to double deep throating and brutal creampie gang rapes one after another. Ultimately, she's thrust into an inescapable, endless rape hell.