Aira Misono, a Japanese high school student, is unexpectedly summoned to the kingdom of Salutania alongside office worker Sei Takanashi through a ritual intended for a single Saint. Crown Prince Kyle Salutania, mistaking Aira's youthful appearance as a sign of her being the Saint, isolates her under his protection, leaving Sei disregarded. This abrupt displacement plunges Aira into profound distress, especially upon learning the ritual offers no return home, culminating in an emotional breakdown witnessed by Prince Kyle. Initially marked by extreme shyness and social anxiety, Aira yearns for friendships but feels undeserving, amplified by frequent criticism at the Royal Academy where Prince Kyle enrolls her. Her modern Japanese social values clash severely with Salutania's medieval aristocratic customs, particularly concerning interactions with betrothed noblemen. Unintentional breaches of etiquette lead to ostracization by female peers, deepening her isolation despite her efforts to adapt. A notable incident involves classmates pointedly ignoring her during a rainstorm, underscoring her social struggles. Aira demonstrates significant magical aptitude, particularly for elemental magic with affinities for water and air. She exhibits an unusual capacity for rapid skill improvement, mastering spells swiftly. Though Prince Kyle initially focuses on developing her Holy Magic due to the mistaken Saint designation, her elemental abilities become evident, especially in the anime adaptation where she actively practices them. Her precision is showcased when she effortlessly gathers rainwater from her clothes into a suspended orb. Following Sei Takanashi's confirmation as the true Saint, Prince Kyle is confined for his error, freeing Aira from his oversight. This liberation allows her to form genuine friendships, including with Sei and Elizabeth Ashley. She graduates from the Royal Academy and enrolls in the Royal Mage Academy to pursue her magical studies, signaling her growing independence and self-direction. The spin-off manga *The Saint’s Magic Power is Omnipotent: The Other Saint* details Aira's continued development. Now working in the Court Mage Division, she conducts experiments with holy water for miasma subjugation and participates in field missions. These experiences depict her increased confidence and integration into Salutanian society as she navigates new environments and professional responsibilities. Her name, meaning "love, affection" (愛) and "good, virtuous" (良), reflects her kind nature. The surname Misono signifies "honorable" (御) and "garden" (園).