Ojousama no Himitsu

From Intercross:

After transfering from an elite girls school, Haru, by her expression and manner, is seen by many as an 'Ojou-sama'. But in truth Haru really is a countryside chick with a fierce attitude! Though she tries not be discovered, she is seen in an unlikely situation by none other but a classmate, Nagase! Thinking she is done for she tries to ‘beat’ her way out of the situation but instead Nagase…?!

Includes 3 extra stories:

• Ultimate Boyfriend and Addicted Girlfriend
Chisako is dating Akiomi, the public morals committee's leader. Due to his strict nature, Chisako hides the fact that she was a former yankee. Will their relationship work?

• Top Secret Boyfriend and Jealous Girlfriend
A continuation of Chisako and Akiomi's story.

• Pure Strange