Seraph of the End: Guren Ichinose: Resurrection at Nineteen

Owari no Seraph: Ichinose Guren, 19-sai no Sekai Resurrection
終わりのセラフ 一瀬グレン、19歳の世界再誕
Seraph of the End—Guren Ichinose: Resurrection at Nineteen (Novel)
Seraph of the End: Guren Ichinose, Resurrection at Nineteen
Seraph of the End: Guren Ichinose: Resurrection at Nineteen (Novel)
終わりのセラフ 一瀬グレン、19歳の世界再誕

Prequel

novel
2013
Publishers:
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)

Sequel

manga
2012
Publishers:
and 1 more
After trumpets of the apocalypse proclaim the fall of humanity, vampires arise from the shadows to rule the earth. Yuichiro wants just one thing—to get revenge by killing each and every vampire. Yuichiro’s dream is near-impossible, given that vampires are seven times stronger than humans, and the only way to kill them is by mastering Cursed Gear, advanced demon-possessed weaponry. Not to mention that humanity’s most elite Vampire Extermination Unit, the Moon Demon Company, wants nothing to do with Yuichiro unless he can prove he’s willing to work in a team—which is the last thing he wants! (Source: VIZ Media) Note: Includes two extra chapters.