I had a stalker when I worked at walmart, about 2 1/2 years ago. She wasn't as awesome as Matoi. She mostly just stood around in the clothing department watching me stock groceries, or listening to my conversations in the breakroom to learn what comics, cartoons, manga, and anime I liked (a guy who worked in Meats was an otaku too). the only time she did anything even a little creepy was when she stayed there for 2 hours (she got off at 6, I got off at 8) and followed me home to learn where I lived. I later found out the reason my girlfriend at the time (a girl who was obsessed with hentai yet wouldn't let me fuck her) broke up with me was because the stalker threatened her. It's also how I found out about my stalker. I found out the details through a friend of hers (who was afraid for my safty). She's now moved on and gotten a normal boyfriend, but we talk when we see each other.
tl;dr needs more Matoi.