From Muses Scans:

Kiniiro no Corda - Daigakusei-hen (La Corda D'Oro - College Arc) is set three years after where the previous series ended. Our favourite characters have moved on to college and are all pursuing the new goals that they have set for themselves. Far away in Austria, Tsukimori continues to keep in touch with Kahoko while steadily expanding his violin techniques. Comparing herself to the rest, Kahoko finds herself in distress! Will she be able to follow her heart and discover her own path as well? The college arc of La Corda D'Oro begins! Stay tuned!