Mikaela hears a rumor about a noble vampire who will hand over food and valuables in exchange for a taste of human blood, and tracks down Ferid Bathory to test it for himself. In a parallel thread, fellow vampire Crowley Eusford looks back on his own human life centuries earlier, fighting in the thirteenth-century Crusades and later teaching swordsmanship before he was turned. This light novel widens the Seraph of the End world with vampire side stories the main manga has no room for.