While working late, Togusa gets a call from one of his colleagues from his days on the police force. It seems that he's uncovered something strange happening with the investigators in the Laughing Man Unit, a special task force formed to catch the infamous cyber criminal known only as the Laughing Man. But before he can meet with Togusa, he's killed in a car accident. Now, Togusa only has an envelope full of seemingly random photos to go on--can he put the pieces of the puzzle together?
After being ambushed by Kuze's followers at a false location, Section 9 is alerted to his true location, and his intentions of purchasing nuclear materials from the Russian mafia.The Cabinet Intelligence Service and Gohda are involved behind the scenes.
The entire city of Nagasaki is evacuated and the JSDF moves in after a live nuclear bomb is found planted in the city, presumably by Dejima militants. Section 9 arrives to defuse the bomb and determine its precise origins.
The government declares martial Law in Dejima, believing that the refugees have a nuclear device and plan to use it to gain independence. When the refugees' connection to Kuze is cut off, one shot begins a bloody war.