Neo Angelique Abyss

While Angelique, a little girl, spends her days peacefully at school, attacks from the terrifying Thanatos have been spreading over the rest of the world. Two Purifiers, men with the ability to wipe out the Thanatos, appear one day. As the only female Purifier, one of them, Nyx, tries to persuade Angelique to join them on their mission. A Thanatos enters their school as Angelique dithers. Nyx and Rayne, the other Purifier, are engaged in futile combat. Angelique's urge to protect everyone is reawakened as she witnesses her friends being devoured by the Thanatos and the Purifiers being defeated. She eventually became the "Queen's Egg," the only female Purifier in their homeland of Arcadia.