Rei, also known as Cinderella, hails from a destitute family and has to wear her brother's outfits, including her school uniform. Due to this, she is always mistaken for a male, even by her bosom buddy, Hakuba Ouji, the white horse prince, who gradually develops perplexing sentiments for her. Meanwhile, Tsukumo Yuki, the head of a gang of troublemakers, falls head over heels for Rei upon first glance, imperceptibly believing that she is a boy.