"Survival", the story.

During the first months of the year 2050 a big explosion destroys an entire city, the worlds alarm activates, and all the countries assume that everything is just another terrorist attack, but now with nuclear power. Nobody appears to be the author of the disaster, but an organization of criminals; called Tsuki Kage, starts a plan to kidnap a high rang officer of the Japanese army, Captain Ichijo Isuma, who is the responsible of creating a special counter-terrorist force, called "Trident Division". With the objective of take information from the captain, the Tsuki Kage plans to kidnap even his daughter, little Karen Isuma, with only 8 years old. An accident action of Hiroaki Ikeda, a cadet from the Trident Division and a friend of captain Isuma, ends the kidnapping plan. Then a process to destroy the terrorist organization starts, before they attack again.