The young Duchess Astrid von Oldenburg has everything. She's beloved by her classmates and teachers, extremely magically powerful, and succeeds easily at everything she tries. She also has a secret: since the age of four, she's had the memories of a college-age Japanese military otaku. She also knows that she's the villainess of an otome game, but she has an ironclad plan for avoiding death or exile: using her magic to create a huge arsenal of modern military weaponry so she can overcome anyone who tries to touch her.