Kai, short for Kaisopol, is a royal, immortal vampire who is being targeted by the soul-eating demon Necrocorvo. The evil beast is holding Kais consort Cirice captive in the castle Frosthaven. Necrocorvo has grown tired of feasting on human souls and wants to capture the immortal soul of a vampire. Kai has to go on a quest through Therondia to confrom the powerful demon and be reunited with his beloved without running out of blood.