Saionji Nanao the second grader that commutes to famous girls school with tradition. It belongs to string music part with Chizuru and Riria that can be called a best friend, the enhanced campus life is sent. It is Mai the younger sister and Tsubaki of the respectable senpai, it is united by six people including a cute junior Ayami, it worked hard at the practice aiming at the music competition held in about one month.