Masked Agent, a mysterious undercover investigator from the National Central Investigation Bureau. Her real name is Rumiko, and she always approaches clients with a calm, trustworthy smile. However, her true role involves carrying out special operations in investigations against criminal organizations. One day, while investigating the notorious group "Tokyo Red Oni," she detects suspicious activity—only to be kidnapped as a result. Subjected to torture, her body abused and pushed to the limits of physical and psychological suffering, her fate now hangs in the balance—can she survive this dire crisis?