From Chibi Manga:

A story about a sadistic love interest!! A desperate and clumsy high-school girl entered a famous high school in order to be close to her "Prince." Hiroto may be a prince, but he's also a self-conceited arrogant man! Anyhow, Mitsu is still in love with Hiroto. Will Mitsu be able to get Hiroto's heart even though he only thinks of her as a mere “parasite”?

From Sound of Jewels:

She entered in that expensive school because she wanted to meet the prince of this school.
But then she became his target and it looks like this boy is in fact really sadistic! What will she do...?