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…!?