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. With his stoic partner Hal Kurabayashi, Kai is assigned to track down and stop the distribution of Dragon Speed, a dangerous new drug. But Ryugen, the syndicate trafficking the drug, is almost impossible to infiltrate. Add street violence and a jurisdiction war with the Meguro Police, and poor Kai is in for some very long days at the office.

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.