Seraph of the End: Guren Ichinose: Catastrophe at Sixteen(2013)

Owari no Seraph: Ichinose Guren, 16-sai no Catastrophe

The apocalypse is not only near, but a certainty. Set before the event and the aftermath detailed by the hit manga, this stand-alone prequel light novel series chronicles the inexorable approach of the reign of vampires. Witness the trials of Guren Ichi­nose, who must hide his true strength even as he is trampled on at an academy for the insufferably privileged.

(Source: Kodansha USA)