Prologue:
If anyone would have looked into the cave in the center of Celestic Town that night, they would have seen a small figure sitting on the ground near the deepest part of the cave, holding a tiny flashlight at an odd angle. They probably would not have seen that it was a young girl, with curly blonde hair that fell to her shoulders, and that her flashlight pointed toward the ground because her eyes were closed, and the flashlight had been forgotten.
"I hear you. I'll remember this. I promise, I'll always remember this!" the girl whispered as solemnly as one so young could. At least, it might have been a whisper. Even she wasn't quite sure whether the words had been spoken out loud.
She then rose, switched off the flashlight, and walked away. Behind her, three spots on the wall glowed faintly, so faintly that they were almost invisible even in the darkness.
By this slight light, even the most careful of observers would not have seen a smaller figure follow her away from the cave.