As the end of term approaches at Kamakura Girl's School and summer draws nearer, Ichika Tachibana, 14, eagerly awaits the chance to make unforgettable memories with her friends. Little does she anticipate that this summer will be like no other. During the clean-up of an abandoned school building, Ichika spots the reflection of an unfamiliar girl in a mirror. Her friends believe it to be a mere optical illusion, but Ichika is taken aback when the same girl presents her with a lost cellphone. The girl introduces herself as Manatsu Kuroki and confides a secret: Ichika's phone charm now enables her to harness the powers of 12 Djinn dedicating themselves to safeguarding the world and its marvels. As Ichika interacts with these spirits, she will embark on a journey of exploration and enchantment. Yet, as the Djinn display breathtaking wonders to her, they will also confront her with overpowering emotions...