Tokyo Boys & Girls(2005)

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!