When Princess Adelheid Kotrov of the Kotrov Empire leaves her nation for an arranged marriage, she holds little expectation, only hoping that she and her future husband can get along well. However, upon her arrival at the Echmont Empire, she is immediately humiliated. Emperor Karl Ulrich Echmont demands Adelheid's subservience and silence, while his concubine, Diane Poitier, shamelessly flaunts her unchecked influence.

Despite being alone in a foreign land, Adelheid refuses to surrender. Her education has prepared her for becoming an outstanding empress, and she is also a striker—a powerful mage capable of single-handedly destroying the towers that drop from the sky and unleash swarms of wild monsters. Adelheid has no interest in Karl, but she is determined to find a dependable ally, resolve the poorly handled issue of the towers, and take charge of all that rightfully belongs to her.