The human girl Lena is sacrificed to Draven, a Vampire King afflicted by a petrification curse, and the two unexpectedly forge a life-binding blood pact. To save Draven—who is left dying and drained of his royal blood after the curse is broken—Lena endures seven years of perilous hardships to locate the source of the Blood Spring and rescue her true love. Ultimately, they ascend the throne side by side, ruling over a kingdom where humans and vampires coexist. Yet, just as peace dawns, the sigil of an ancient witch quietly begins to glow red deep within the Blood Spring...