Once upon a time, in a galaxy far far away.... Wait, no. It was this galaxy, and the time was 1392...
A craftsman built a piano, if only to be played someday. And it was. A rich family bought it and played it and all that jazz.
But it didn't last long. Merely twenty years later, a fire destroyed that house and that family. And it broke the piano in half.
Out of seemingly nowhere, maybe it was the ghost of one of the family members, maybe it was just magic, two ghosts appeared.
The two ghosts couldn't talk, as if their vocal chords didn't exist. But, they produced a nice melody from a piano.
A passing shinigami with a curse of her own was traveling by one day. She came across the two ghosts. In exchange for only being able to play the piano with one hand each, the two were permitted to live on as ghosts.
However, they took the form of two human twins-- supposedly two of whoever lived in that family.
They can interact with humans and other entities, however communication is sometimes an issue.
