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. Shaken up by the revelations about Kai after the Yokohama Ryugen incident, Hal needs some time to sort things out. Then a new case lands on the NCD squad when a mysterious accident leads to an investigation of Black Fall, an up-and-coming rock band, and its troubled lead singer, Saeki Kanzaki.