Tokyo Boys & Girls(2005)

Tokyo Shounen Shoujo

The school year starts off well when Mimori befriends the beautiful Nana, but things quickly turn sour for her when she is chosen to be the class representative. Through a series of unfortunate events, she finds herself the focus of attention by three boys and her teachers for all the wrong reasons! Mimori is reunited with Atsushi, a boy she knew in elementary school--and it turns out he despises her for allegedly bullying him in their grade school days. In fact, he plans to exact a little revenge!

(Source: VIZ Media)

Included bonus stories: Basically Pure-Hearted, Kiss the Mike!