Legend tells of a mysterious artifact known as the “Skull Heart” that has the power to grant a young woman’s wishes. Of course, there’s a catch. If she has an impure heart, even a selfless wish will be twisted in the most vile of ways: peace brought through brutality, eternal life through perpetual childhood, or a lost love returned as an undead monster. Hundreds have sought the Skull Heart, but so far none have been deemed worthy and spared its cruel power. Those judged impure are transformed into the fearful instrument of their twisted wish… a pale and lovely tempest, a beautiful nightmare – the Skullgirl!