Sacred Curse

After awakening from a deathlike dream, Charlotte's life turned into a terrible tale.
Her memory is corrupted.
Her heart will stop beating without the strange, unbearably bitter medicine.
Her body is altered by the forbidden skill of the Darkland.
She shouldn't even leave the mansion into the garden.
Also, she shouldn't go down to the underground laboratory, enter the West Wing, and approach the mirrors.
Constantine is Charlotte's guardian. He is an alchemist, necromancer, master of the forbidden arts, and master of pale black-eyed servants.
Constantine says that Charlotte is special, but who is she really to him?