Some time ago, so-called “black technologies” appeared in the world, giving humanity unprecedented possibilities—especially in the military sphere—so that on the battlefields huge humanoid combat robots now rule the day. Knowledge of “black technologies” is kept in the memories of only a few Initiates from birth, even though they cannot explain where they got such knowledge. Naturally, the world’s intelligence services actively pursue such people… And then “Mithril,” a private military peacekeeping organization, learns that an abduction for the purpose of extracting “black technologies” is being planned against an ordinary Japanese schoolgirl, Chidori Kaname. To protect this so valuable person, a young experienced fighter, Sagara Sousuke, is embedded into her circle. And everything would be fine if he had even the slightest idea what an ordinary peaceful school life is made of…