Hematos come from unions of gods and mortals, and children from the union of two hematos of pure blood have divine powers. Hemato children and mortals have powers, of course, but not that much. Half-bloods have only two options: become trained Guardians who hunt and kill demons, or become servants in the houses of purebloods. Seventeen-year-old Alexandria would rather risk her life in battle than scavenging and cleaning toilets, but she grew up in the slums, anyway. There are several rules that students must follow as part of the pact. Alex has problems with all of them, but especially Rule #1 : "Relationships between pure-bloods and half-bloods are prohibited." Unfortunately, she falls really hard for the sexy pureblood - Aiden. But falling in love with Aiden is not her biggest problem - she still needs to stay alive long enough to graduate from Covenant (an educational institution) and become a Guardian. If she fails to fulfill her duty, she will face something worse than death or slavery in the future - she will turn into a demon and Aiden will be obliged to hunt Alexandria. It will be kind of crap