Owari no Seraph: Guren Ichinose's Catastrophe at 16

Owari no Seraph: Guren Ichinose's Catastrophe at 16 summary:

The apocalypse is not only near, but a certainty. Set before the events and the aftermath detailed by the hit manga, this stand-alone prequel 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.