Waratte! Sotomura-san(2009)

Known as the hardass delinquent of her school, Sotomura is feared by everyone and has a nasty reputation. But in truth, she is an incredibly misinterpreted girl. The mean look everyone thinks she gives is just her not knowing how to smile. The scary comments she makes is only because Sotomura isn’t good at expressing her feelings or taken way out of context. And the badass appearance she has is the result of her believing that cute girly things don’t match her. Not wanting to go on with life like this, Sotomura tries to change her image, but the more she does, the more her reputation becomes more set into stone.

(Source: MangaHelpers)