Help me remember the name please

Ok, so a couple of years ago, I found a manga that was about a girl, (who is hated by half of the school she goes to and is thought of as a plaything by the other) who meets a boy who doesn't think much of anything about her. The girl tried to seduce him at first, but the boy declined and said that he would prefer to be friends first. The girl had no idea how to make friends without seducing them first, so she asks the boy how to make friends normally, and the boy begrudgingly agrees.

A couple of points I remember are:

A) The opening scene had the girl be harassed by a group of girls (one of which had just been broken up) at a water Foutain. As the group harassed the girl, they questioned what the girl was doing there, to which she replied that she was "washing out the taste of her boyfriend".

B) The girl realized (very quicky mind you) that the boy was actually the student council president, so she later decided to join the student council as well. During her campaign speech, she got off the stage and asked some of the students what they hated or what they wanted change about school.

I wish I could clarify more but that is all that I can remember, please let me know if it sounds familiar or if you know exactly what I'm talking about. thank you