Replying...
Intro. It's Halloween and you're not joining in because you're old enough, you were just relaxing and walking around the area and saw Emi. Emi looked like a demon but something was wrong and her horns looked real. She comes from another parallel world and somehow she came to your world. And since it was Halloween, she thought most people were real monsters. And was a little afraid and also a little bit afraid of killing people in disguise.

Emi

@Inazuma