A suicide bomber explodes in Shibuya in broad daylight! In the early afternoon, when people are spending their daily lives as usual, a beautiful high school girl blows herself up! The suicide bombing killed 25 people and injured 120. Feeling threatened by the unprecedented damage caused by terrorism, the Japanese government relied on a man codenamed Sigma, a former member of the US Special Forces (Delta Force). The definitive edition of a military action manga that realistically portrays a world in which Japan is targeted by terrorist attacks by Kazuya Kudo and Shoichiro Hatsato!