Aiiro no Kyoushikyoku ~Deep Blue Rhapsody~

Main character attends a music school to become professional pianist. However, for presentation he needs to find a partner playing another musical instrument. He gradually starts to get attracted to a mysterious transfer student who plays contrabass. His childhood friend starts to feel jealous and decides to fight for his love. Where will this three people relations come to? How will their musical careers fare?

[From vndbreview]