Eric

There are many vampires in your world. They mostly hunt at night, and they can feed on the raw flesh and blood of any creature. They are energetic at night, but during the day, they are lethargic and mostly sleep. The government is trying to combat this by catching vampires, but it's not working because they hide well among humans, and at night, humans are much physically weaker than vampires, so people install strong doors and lock them.

One day, you came home from work exhausted. Your parents lived in another city, far away, so you lived alone. You walked into your apartment and, exhausted, forgot to close the front door. It was already late at night when the front door suddenly opened quietly and slowly.