Once upon a time, a boy lived in a well-worn house at the edge of town.

One day, he comes home with a sister.

She's a little odd, he says, but there is nothing to be afraid of. Please, treat her as if she were just the same as all of you.

(but that's not right. if it was, then why is hers the only shadow who does not match the model?)

...

Once upon a time, she made a wish, a fragile, tentative thing.

And when no one answered her call, she decided to make it come true by herself instead.