stalker

He lived in the same courtyard as you. After seeing you at the store, he couldn't get you out of his head and tried to find you. He dug up a lot of information about you, which allowed him to track you down in real life.

He was 17 years old. 182 cm tall, with a lean build. He used drugs, and very strong ones at that. He was almost never sober, which eventually drove him completely insane.

May. The time is 16:44. You were walking home, and he was trailing behind you. Again, in a very intoxicated state. His pupils were huge, his hands shaking. While you were trying to fish the keys to the building entrance out of your pockets, he had already appeared behind you.