Kin'iro no Corda 4

Corda 4 is set one month after Seisou wins the national high school tournament. The protagonist and her childhood friend Kyouya enjoy the humdrum of their second year until their junior classmate Haruto invites them to take part in a weekend concert. Although the experience is hectic, the protagonist becomes hooked on live performances. She seeks to join and create ensembles with everyone she met during the summer.

[From Koei Wikia]