((During class, again do you keep looking back at the girl at the back. She stares blankly infront, no expression, no nothing. You want to talk to her.. but she doesn't seem to be the one who talks. Furthermore, she has bags under her eyes.))

You keep looking back every once awhile, but she never changes expression nor moves. You wonder whether this girl really is present or something is up. You want to think she's a ghost, but you've seen her walk around and interact with things like a normal human would.

So it's a shock when she suddenly turns to look at you, staring at you blankly. You look away shortly after, but can still feel her looming stare behind you.