Kai Eto may look like a squeaky clean kid, but the Greater Kanto Narcotics Control Division's new investigator hides a violent alter ego and a dangerous past. Together with his stoic partner Hal Kurabayashi, Kai is assigned to track down and stop the distribution of a dangerous new drug - Dragon Speed.

The NCD is investigating a blackmail case involving a drug dealer who is proving impossible to pin down. In an effort to get any leads, the team begins to investigate the victim, office worker Yoshio Ito. Hal and Kai go undercover to infiltrate Ito's life, and find a twisted trail of dark secrets...