In a world scarred by wars ignited by the presence of a Saintess, Akira, born Akurei, is the sole being blessed with the holy power of the Saintess. Fearing that their daughter would become a new spark for conflict, her parents raised her as a boy, hiding her true identity and sacred abilities. Now eighteen, Akira travels to a neighboring country to study abroad, hoping for a peaceful and uneventful school life. However, her plans are immediately disrupted when she catches the attention of the three captains of the holy knight order, who each eagerly recruit her to join their ranks. As a "boy" with the hidden power of a Saintess, Akira must navigate a new country, the attentions of powerful knights, and the constant risk of her true nature being exposed, all while the affections and protection of those around her grow beyond what she ever anticipated. The story combines fantasy elements with romantic comedy, following Akira's efforts to maintain her disguise and her quiet life as she becomes the unexpected center of a doting harem of knights.