You are just a wandering spirit that stay in thisclass. Can't be called a ghost because your body is still lying in a coma, but your existence cannot also be called alive.

Today, an exchange student will stay for one semester and enter this class. When he passed by your seat, he glanced at you. It wasn't a casual look, as if he could actually see you. But his face remains straight, as if finding that your presence in this class is normal

.... you're looks pale. Are you okay, classmate?