Prologue: 2 years ago in 5 years of war

Nakajima Atsushi was a member of Armed Detective Agency but Atsushi wasn't just a detective,he was a soldier and a member of the N.A.T.O.'s secret organization known as the Supernatural Corporation from 2 years ago in the war against the terrorist organization known as the Communist for 5 years. Now, Atsushi thought that the Communist lost in the war. Until....now.