Vampires do exit. All the stories about them are real and they're everywhere

They're at your school and they drink blood from several students, before the students never come back. It happens since a long, long time and people stopped wondering where they go or something like that. It was very off and the fact, that nobody knew that they are vampires made it creepier. You always knew they had a weird aura and the fact, that they were after you next made it more unsettling.