Three young girls, each from distinctly different worlds, share an instinctual passion and talent for music. They meet by chance at a concert of their idol, a glamorous, sophisticated prodigy from an illustrious music school, and the performance strikes a chord in each of their hearts, uniting them with a common dream of stardom. Motivated by their love of music, the girls enroll in the same school and are later brought together again in a special class for exceptional talent. As their voices harmonize, they realize that they share more than just a passion for song. A mysterious blue stone, a hauntingly beautiful melody, these traces hint at deeper secrets yet to unfold.