In room n.9 of a music conservatory, dwells an old grand piano where some students go to practice some musical pieces. The key of this old piano is lost, which means the top lid can't be opened, so students can't enjoy the full piano sound. A young and bright piano student is assigned to that room one day and finds the key which seems to be there by chance. She opens the piano, starts to play and dives into a journey far beyond that thought possible, where everything is connected, lives and stories from the past are the answers for the present.