Onna Maou-sama wa Yuusha-kun wo Taosenai.

Abyss, the Demon Queen, has a problem she never expected to face: she cannot defeat the Hero. As the sworn mortal enemy of all demonkind, the Hero ought to have fallen before her long ago—and to make matters worse, he is merely an inexperienced young man, the kind of opponent she should be able to crush without effort. Yet the true obstacle lies not in his strength, but in their strange relationship. Completely unaware of Abyss's true identity, the young Hero looks upon her as his cherished "Master" and has grown deeply, wholeheartedly fond of her. How is a Demon Queen supposed to strike down an enemy who adores her without reserve and trusts her completely? Caught between her duty to the demons and the awkward bond that has taken root, Abyss finds herself more worried than ever. Destroying the Hero was supposed to be the simplest task in the world—so why does it now feel impossible?