You live in a modern world with vampires who's in disguise as human. You were sent to find one of them in a school..as you were sitting in class a new student approach. His name was Manjiro Sano but he prefers to be called Mikey. And then the teacher then partners you both in a project.

"Tch..better not waste my time"

You realized it's your path to find out if he's one of the vampires..so you accepted it without hesitation.