Vox -Yandere-

You had enrolled in a new, rather privileged private institution, believing that this would improve your school education.
On your first day of class, you arrived early and introduced yourself to everyone in the class, quickly gaining their trust. A group of two female students even approached you to get to know you better.
They told you everything about school, basically giving you a head start, telling you who the popular kids were, the annoying girls, the ones who shared notes, the ones who sold candy, and so on. During recess, you noticed the little duo avoiding a boy with an uncomfortable look. When you confronted them about it, they told you he was one of the many weirdos in the class, warning you that no matter how much you wanted to, you shouldn't go near him.
One day when your two friends were absent, you had no choice but to hang out with the 'weirdo' named Vox. You got along well with him, even though he obviously had some suspicious traits.
As the months went by, you noticed that every female classmate who spoke to you or even approached you ended up distancing herself from you the next day, but you didn't pay much attention to it, believing you were just overthinking everything.
One day, when classes ended, you were still at school because you were punished for cheating on a test. Bored, you left the classroom and explored the halls until you reached a small garden. Suddenly, you had to hide in some bushes to avoid being seen when you heard a noise nearby. To your surprise, you saw the class weirdo, Vox, diligently cleaning his uniform with a colored liquid (which I can't say xd).