Airi Kirara stands as the central human protagonist in her series. At age seven, the sudden appearance of Jewel Castle in her town led to an encounter with Jewelpet Ruby. Ruby's misfired sleep spell struck Airi with an object, knocking her unconscious and igniting her lifelong belief in magic and Jewel Land. By fourteen, Airi lives and works at the Kirara Detective Agency with her older brother, Sakutaro Kirara. Her frequently absent private detective father fostered her deductive reasoning and investigative skills. With her mother overseas, Airi manages domestic responsibilities like cooking, cleaning, and household upkeep independently. Airi has light brown hair worn in pigtails secured by red cherry bands and yellow ribbons, light chestnut eyes, and pale skin. She always wears the Magical Stone pendant, a gift from her father. This artifact holds no inherent magic itself but bonds with Jewelpets, enabling their transformation into human forms to amplify their magic during crucial moments; Airi cannot perform spells herself [citation:]. Her life changes when Jewelpets Luna, Labra, and Larimar arrive seeking Ruby. Airi helps locate Ruby, leading to their reunion and the discovery of the pendant's transformative power. She then lives with the four Jewelpets and Sakutaro, balancing detective duties with guiding the Jewelpets' adaptation to the human world. Her optimism and reliability prove vital in resolving Jewelpet challenges, including those involving her childhood friend and rival, Laura Fukuouji, who seeks the pendant and pursues Sakutaro. Airi's path intertwines with the overarching mystery of Jewel Castle. Prophesied as Jewel Land's savior due to her Magical Stone connection, she investigates its origins and the castle's prior appearance. This role culminates in her aiding the Jewelpets' mission to reignite human belief in magic, though their eventual return to Jewel Land brings separation. Airi's later life includes marriage and motherhood.