Graphic novel or manga with a fantasy setting

[doctormexicanmd]

I read the first one of this series between 2008 and 2009. The parts that I remember about it was that the main character was a virgin and somehow her being a virgin gave her abilities of some sort. early in the book she got drunk and had a one night stand, also there was a horse that ate a human in order to get three wishes one of which was the ability to digest meat so he wouldn't die, the other was the ability to breathe fire and the third was to be giant.