Episode 4

Blood Line Fever (BLOOD LINE FEVER, BLOOD LINE FEVER) is the 4th episode of Kekkai Sensen anime.

Synopsis
Leo spots a person with a crimson wing-like aura, whom Klaus later determines to be one of the vampiric Blood Breeds. Soon after, the vampire expert "Lucky" Abrams arrives in town to use Leo's vision to learn more about the Blood Breed threat.