Ao no Ballade ~Ballade de azure.~

Akira is an amateur musician aiming to become a professional. On a rainy day he meets a girl while working a part-time job. She turns out out to be a daughter of a famous musical producer. Her father becomes the biggest barrier on the way to love as he promises Akira to disqualify him from a musical contest if he continues to pursue producer's daughter.

[From vndbreview]