A luxurious and splendid battle fantasy featuring ability-wielding girls! The year is 1930 in the Holy Era. In this world, two great nations are sharply at odds. The "Empire," which seeks to rule the world through "magic," and the "Theocracy," which aims to govern through "angelic arts." Both nations are engaged in a covert struggle over the "Saintess," of whom there are only ten in the world. The "Saintess" is a being that wields supernatural powers and performs miracles. Whether a nation can acquire this "Saintess" before its enemy determines its fate. The girl Mary, an assassin known as the <Grim Reaper> and considered the strongest in the "Empire," is given a mission that she must fulfill at the cost of her life: "Infiltrate the all-girls boarding school of the Theocracy and assassinate a hidden Saintess there." When the <Grim Reaper> and the "Saintess" meet, a new story unfolds around the girls who are tossed about by a cruel fate. This is the first appearance in the Gagaga Bunko of Nekoji Shi Koneko, the author of "Revenge Magia: Breaking Magic," presenting a luxurious and splendid battle fantasy featuring ability-wielding girls! The illustrations are by Minakata Sunao, known for the comic "The Riddle of the Devil" and "Don't Think You Can Defeat the Demon King, You Fool!".