The apocalypse is not only a certainty, it's near.
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.
Maybe coming in
Owari no Seraph: Ichinose Guren, 16-sai no Catastrophe Chap 10
Owari no Seraph: Ichinose Guren, 16-sai no Catastrophe Chap 11