Call on her when nightmares become a reality! In an obscure world gripped by terror, our worst nightmares have come to life, becoming monsters that resemble humans. Faced with this threat, the Epeires corps, an armed wing of the Ordo-Sancti, a powerful religious group, becomes for a ray of hope in a world of darkness. By vanquishing the creatures coming from their own dreams, the Epeires awaken within themselves remarkable occult abilities. They're able to free those who are imprisoned in their own nightmares and destroy the powerful beasts that have been terrorizing them with magic spells. Arane Heos, a cold and dispirited woman, is a member of the Epeires. A skilled swordswoman, she has slain more beasts than anyone can remember. But a burdensome secret, one that she has only confided to her friend Bastione, is going to put them on a collision course with the zealots of the Ordo-Sancti.