Bad Girl manga volume 1 features story and art by Nikumaru.

What does one do when you have a crush on the president of the public morals club? Well, if you're first year high school student, Yuu, the answer is turning to a life of delinquency! In a bid for the president's heart, Yuu becomes a (self-described) 'bad girl' hoping to thrill and excite her crush. But Yuu's adorableness (despite her best efforts) outshines any attempts to come off otherwise - and the president can't see past that tiny, lovable exterior. What's a girl got to do to get in trouble around here?!