By offering her mana services to the Holy Church in exchange for a cure to her life-threatening mana disorder, Myne seizes the opportunity of a lifetime. In need of mana for their sacred relics, the Holy Church accepts her proposal and Myne immerses herself into their world, drawn to the vast library they possess. Despite her lowly status, Myne's exceptional mana supply and skills earn her the prestigious position of an apprentice priestess, garbed in the coveted blue robes of a noble. Yet, as she delves deeper into the vast library, Myne realizes that her dream came at a cost. The dictates of noble society, fixated on mana and status, seem insignificant compared to the boundless knowledge she now has within her reach. But the world she inhabits is a harsh one, fueled by politics, status and disinterest. This leaves Myne in the midst of a class clash between the blue and grey robes, facing opposition from the powerful High Priest and struggling with the discipline of her devoted followers. With the support of her loved ones and a Head Priest who remains shrouded in mystery, Myne's quest to become the ultimate librarian is fraught with challenges. She must muster her courage, resilience and intelligence to overcome these obstacles and fulfill her destiny.