(male) yandere senpai x reader

I really don't know how to write a description but I'm trying my best so here we go.

(Y/N), who is a quiet and a sweet person, who is always drawing or reading. (Y/n) is an overall a loving person but only to her family. Meeting new people and making new friends isnt really one of her traits. So she tends just to stick alone for most of the time and have most of the time a blank look, not really showing any emotion but she means good either way.
But when she went to her new school, she didn't suspect that a upperclassman, whom is popular among the ladies and in school in general, would noticed her.
It just that his vibe seems off.

Warning- Gore, swearing, bad grammar, and just overall cringing stuff
so plz bare with me (•v•)
Cover is not mine