This being Nakamura Regura, when I saw "Kill Yourself" written on the school desk during Ghost Lady's flashback... I'd not be surprised if she was a ghost! The title suggests she haunts (and fucks) boys in a similar situation to hers... and (maybe) after the final panel, steals their souls when she answers the door. Like answering the phone in "The Ring" but, a MILF, and sex. Lots, and lots, of sex.