A brilliant doctor-turned-assassin's sense of justice is ignited when his wife is brutally murdered by a sadistic criminal known as Hamazaki's Son. Consumed by revenge, the doctor formulates a horrifyingly ingenious plan to take down the elusive psychopath. He enlists a drug-addicted woman and transforms her into a lethal weapon. Through grueling and excruciating training, she is not only sculpted into a proficient killer but is also conditioned to withstand immense pain, setting the stage for an audacious assassination plot.

The culmination of their intricate preparation has the woman infiltrating an impregnable, highly-secured facility frequented by Hamazaki's Son. Inside her body, she carries dismantled gun parts, ready to be reassembled for a lethal strike. As the critical moment approaches, she is faced with unimaginable physical and psychological ordeals that test her endurance and resolve. Her mission: to navigate a fortress teeming with guards, reclaim her fragmented weapon, and finally mete out the doctor’s long-sought vengeance. What unfolds is a brutal symphony of violence and retribution, driven by sheer will and meticulously orchestrated chaos.