In a world of swords and magic, young girls plagued by Demons seek safety through the Holy See. They surrender to the clergy, forming master-servant Contracts with Priests to become Demon Attendants. As they confront external threats and personal turmoil, the story explores dark themes of betrayal, desire, and complex relationships. Intense male-female romance meets subtle yuri undertones, leading to a climactic 1V1 conclusion with elements of infidelity and NTR.