Shoujou manga HELP

So, I kept on looking but i can't seem to find this manga.
It's a shoujou, school-life manga, about a girl who the other students are scared of because they think she's a delinquent. She is always alone in her house because her parents left her there. In her school, the student council member are treated as celebrities, eventually this girl fell in love with the student council president who is sadistic in real life. They actually became a fake couple and the girl left her house and transferred to the house where the student council members live. The guy has blond hair and not that tall. He's just a bit taller than the heroine. The heroine has black hair and always dress in dark clothes I think.