Twenty years ago, a series of tragic events almost ripped the blue-collar town of Millwood apart. Now, in the present day, a group of disparate teen girls finds themselves tormented by an unknown Assailant and made to pay for the secret sin their parents committed two decades ago, as well as their own.

To save her ailing father from serving in the Imperial Army, a fearless young woman disguises herself as a man to battle northern invaders in China.