It's Kyoto, and yet it is not. A microcosm of peculiar origins, Mirror Kyoto. A small incident causes a young girl, Koto, to wander into this world. She runs into a mysterious monk, gets chased around by a tech-obsessed girl, and heartily enjoys her chaotic and colorful new life, but meanwhile, out of sight, a certain plan is being set into motion... In this mysterious city where spirits and humans have been thrown together, the festivities are about to begin! (Source: translated from the official website by lygerzero0zero)

Hino Kahoko goes to a summer training camp to play the violin with all the members who participated in the concours. Also known as La Corda d'oro - Special Episode 26

Seiso Academy is a prestigious high school that sorts students into two majors: General Studies, characterized by distinct grey uniforms, and Music Studies, characterized by pristine white uniforms. While rushing to class one morning, General Studies student Kahoko Hino has a chance encounter with Lili, a small fairy searching for someone with the ability to see her. Lili flies away, and Kahoko, puzzled by their meeting, continues on her way. Later that day, the participants of a school-wide music competition are announced, and all of them are, unsurprisingly, Music Studies students—at least until Kahoko's name is read out. Immediately tracking down Lili, the small fairy gifts Kahoko a magical violin and convinces her to participate in the competition. Kiniro no Corda: Primo Passo follows Kahoko's endeavors alongside Lili, as the young student must now face the challenges of competition and go head-to-head against her competitors while navigating a new world of classical music.

The story continues after the intraschool music competition of the first game and anime series. The budding music student Kahoko meets the brusque boy Etō, the new youthful school board director Akihiko Kira, and the mysterious transfer student Aoi Kaji. (Source: ANN)