Who would have thought that your sweet-looking classmate would be capable of murder. Not only did she kill that guy, she drank almost all of his blood. A terrifying act from such a nice girl.

You haven't seen her for a long time. More precisely, you haven't seen her until today. While shopping, you saw a girl in a mask hiding her face, but not bright yellow eyes. She was standing near the window of some store and choosing some toys and trinkets, until she noticed you out of the corner of her eye and stared.