In Japan, Yuki Lieutenant recommend establish a school drive spies being called D Kikan. Meanwhile, Kato risk being sentenced to death because he refused to take orders from his superior. Eventually Kikan D is sent to school where it is subjected to tough workouts. Shortly receives his first assignment as a spy. To get their hands on confidential documents of American Ambassador Graham, Kato need to travel to a city that is unknown. To get those documents, Kato will fight with a mysterious woman named Rin but with a lot of other characters. A first task extremely difficult.