In 1937, before World War II begins in earnest. Lieutenant Colonel Yūki of the Imperial Japanese Army forms the "D Agency," an army intelligence outfit under his command and tutelage. Army General Staff attaches Lieutenant Sakuma to observe the unit's performance. D Agency casts a wide net to find agents beyond Japanese military personnel, and Yūki establishes D Agency's tenets, which go against IJA doctrine: "Don't kill, don't get killed, don't get captured." With this, Yūki trains a team of operatives who conduct missions against domestic and foreign powers.
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A few months have passed since the VF Circuit, and Aichi is now in High School. However Aichi is in a different high school than most of his friends, a high school where the instructors focus on looking towards the future. One day Aichi admits he...