Set along a backdrop of a fictitious second world war at an international city in Asia. In Japan, Lieutenant Colonel Yuki (Yusuke Iseya) recommends the creation of spy training school D Kikan. Meanwhile, Kato (Kazuya Kamenashi) is facing capital punishment for his refusal to follow a superiors order. Kato is then scouted by D Kikan. He goes through a harsh training regiment and faces his first mission as a spy. In order to seize American ambassador Grahams confidential documents Black Note. Kato infiltrates into an international city. A battle to gain possession of the Black Note ensues between Kato, a mysterious woman named Rin (Kyoko Fukada), the British Spy Agency, the Soviet Spy Agency and the radical army in Japan.