A foreign world shaped by magic, hierarchy, and prophecy becomes the setting for an unexpected story when a Holy Maiden is summoned—along with an uninvited second girl who was never meant to be there. While one rises as the kingdom’s hope, the other is quietly pushed aside, choosing a simple life in royal accounting despite her dangerous weakness to magic. Yet her talent with numbers begins to uncover things that should remain hidden, drawing the attention of a cold, powerful general named Zack—whose interest in her may change far more than either of them expects.