Kyoya Ida is a tough detective who serves in the Shinjuku Police precinct. He is notorious among his colleagues for being an uncompromising figure who is willing to use deadly methods in order to crack cases. As a result, he has earned the ire of both lower-ranking and higher-ranking officers at the National Police Agency. Nevertheless, there are those within the force who applaud Ida's bravery and ingenuity in applying lethal tactics when all other avenues of investigation have been exhausted.