DEEMO Memorial Keys

Deemo is a mysterious being who lives alone in a castle. One day, a young girl falls from the sky, with no memory of who she is or where she came from. To help her return home, Deemo discovers that a tree grows taller on top of the piano whenever it plays. But as Deemo grows accustomed to the companionship it never had before, what will it do when the time comes? And when the girl's lost memories begin to return, how will she face the truth they reveal?