La corda d’oro -Blue Sky-

While being called a "genius violinist," high school sophomore Kanade Kohinata feels herself entering a plateau period and difficult to improve her musical achievements. She reunited with his childhood friend Ritsu Kisaragi at his concert and met his younger brother Kyōya. Ritsu, in a forceful manner, asked both Kanade and Kyōya to transfer to his school, Seiso Academy, to prepare for the upcoming national musical competition. Kanade's relationships with Kisaragi brothers and other handsome young men shall create more than just a few ripples in her heart.

Synopsis from Anime News Network