Random PJSK au I don't know what to call

Regular student Momoi Airi always had an interest in ghosts and stuff! No matter what school it was, where it was, she'd always listen in on other's conversations, if she heard a peek of some supernatural! Well- she heard a rumor about some ghost inside one of those abandoned classrooms(this school's kinda old and it hasn't really have much renovations or anything), yet the said ghost would only appear if it was night!
Since Airi knew she wasn't really.. y'know allowed in the building at night, so she decided to just test her luck and see if the ghost was there.. WAS IT THERE? Heh heh not telling you!(sorryyy)