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 dangerous new drugs. Hiki and Kajiyama nail a small-time student drug dealer. The student folds like a napkin, and they turn him into an informer. But when things start going wrong, Hiki gets suspicious of their new stoolie and begins to wonder who is really playing whom.