Deemo: Memorial Keys

Synopsis

Within the isolated walls of an expansive castle, Deemo, a mysterious being, lives alone. One day, a little girl descends from the sky, her past and identity completely forgotten. When Deemo tries to help her find her way back, he discovers that every time the piano is played, a tree above grows higher. How will Deemo adjust to this new company, and what will occur if the girl faces the truth of her restored memories?