In the old town of Haragon, virgin maidens are being chosen and sacrificed to the dragon who lives in its lair near the mountains. In exchange for this, the town is under the protection of the dragon and cannot be harmed by other monsters. Year by year, beautiful, weeping, maidens are sent to the mountain, never to be seen again. But then, when the Choosing comes for her sister, Lyrra, Astraea steps in and disguises herself as the former to save her from the dragon. Her mission is to put an end to the dragon's reign of terror once and for all. However, the great dragon she came for is not what she had expected at all. And before she knew it, she became the slaves to his whims and desires. Can Astraea complete the vow she made or will she just become another unfortunate maiden?

Sanctorum Academy is a mysterious school situated in a secluded place, outside of town, surrounded by dark rumors. When Erin Violet transfers to this school in the middle of the school year, she gets entangled in the web of lies, deceit, and mystery--that might be connected to a past she never knew about.