Cinderella wa Nemuranai

Ellie, a secretary to the king of Korosol, is known for her earnestness, but not for her looks. Despite that, she's had a dream since she was a little girl of dancing the waltz like Cinderella, if only for one night. One day, that dream is on the verge of coming true after she borrows a dress from Princess Lucia and heads to the ball. But on the way, she is mistaken for the princess and kidnapped! Ellie finds herself trapped in a filthy hut, surprised to see that one of her kidnappers appears to be protecting her... (Source: Renta!)