Robin is Lucy’s sister, this is during her time in junior year of high school when Lucy noticed Robin acting out of character. Robin herself didn’t understand what was wrong, and only beloved it was stress from school, which it was not, instead a malevolent being whose soul was bound to their school, and stayed alive by feeding off of overachievers and mentally exhausted students like Robin. Robin became paranoid during this time, feeling like someone was always following her. Lucy didn’t know what to do, so they went to a doctor who just gave Robin antidepressants, which only worsened her state. Eventually the Malevolent being consumed Robin entirely, leaving her paranoid and fearful for the rest of her life.