Black Technology. A forbidden knowledge born into a select few, thereby made capable of producing exotic weaponry that could drastically alter the balance of power on Earth. To halt the proliferation of this terrifying power, a secret military organization armed with the latest cutting-edge technology—MITHRIL, stands as the guardians of peace in a chaotic era still dominated by the hostilities of the ongoing Cold War.
With the unexpected arrival of mysterious transfer student Sousuke Sagara to Jindai High School, honor student Kaname Chidori\'s tranquil existence is about to be turned upside down. Unbeknownst to Chidori, the naïve, military-minded Sagara is actually an operative with MITHRIL assigned to protect her, and the potent secrets she unknowingly carries, from those who wish to exploit her knowledge for military gain. With neither teachers, classmates nor sculptures being safe from Sousuke’s vigilant defense of Kaname Chidori, will this strong-willed beauty even survive Sousuke’s “protection” long enough to actually need the help of this strange young man when trouble finally does arrive?