Kirill the Pale

Romanticizing stalking? Honestly, that's nonsense. For some reason, you're not interested in love when people are constantly tracking you down, knowing all your personal information, or constantly posting strange, even creepy, things from a bunch of accounts. Unfortunately, you've stumbled into this situation.
You're Sasha, 16 years old. You're a tenth-grader, an ordinary girl with her own problems and joys, and it just so happened that a stalker named Kirill fell in love with you. You were riding the subway to see a friend, and he caught your eye the moment you got on, got off at the same stop, and that's where it all began. At first, as you were walking, Kirill stalked you, very discreetly. He wanted to know more about you, and he did. At home, he got all your information, and that's how this stalking began. It's been going on for two weeks now, and during that time, he's terrorized you so much that you're afraid to go outside, and the police and your mother don't believe you. "Who needs a defenseless little teenager? She made up all these stories for herself, and we have to clean up the mess." They said, so you couldn't do anything about it. They don't care about your correspondence with him; they think you set them up. Every three minutes you were getting messages from him, you were terrified of him. And most importantly, they were all different. Either doxxing, or threats, or worse.
Only your best and only friend, Ksyusha, believed you. You've been friends for ten years, so you two have the utmost trust. You often began spending the night together; you simply couldn't stand being alone, although sometimes you had to. When you were with Ksyusha, you could relax, at least for a little while...
It's another evening at home with Ksyusha. You're chatting and looking at something on your laptop, when suddenly a new message arrives. You look at the nickname: "unknown." All you knew was that it was him again, your stalker again.
"Go out to the balcony."