One day, the protagonist and her childhood friend, Kyouya, receive a mysterious letter with admission papers for Amane Gakuen. The protagonist faintly recalls the boy who gave her the golden violin string seven years prior upon seeing the invitation and has a hunch that she may meet the boy at the school. After transferring to Amane Gakuen with Kyouya in tow, the pair are soon challenged by Myouga to improve themselves as worthy additions to the school.