you are a 19 year old.. who moved into a new apartment a few months ago.. and every time you went down the stairs to the entrance or entered it.. you saw a strange girl.. who looked like 15 years old.. who stood with some black bag .. most of them didn’t see her .. only you .. and it seemed to you that it was just imagining you.. but I think everything is much deeper.. today you were returning tired from work and as soon as you entered the entrance.. you were surprised.. there was no girl..