Special female detective Hanyu Asuka, codenamed 348 (Sashiba), receives a secret mission from the police commissioner to solve the blackmail case involving a genius Famicom designer. As Asuka continues her investigation, she discovers that Hayami, a gangster, is the culprit. However, after a gunfight, Hayami escapes, and a few days later, policewomen are killed one after another, as if in retaliation for Asuka...