Higanjima X
Japanese title: 彼岸島X
Type: ONA
Source: Manga
Episodes: 12
Status: Finished Airing
Aired: Oct 15, 2016 to Mar 25, 2017
Duration: 3 min per ep
Rating: R - 17+ (violence & profanity)
Studios: Fever Creations
Genres: Fantasy, Horror
Themes: Gore, Vampire
Demographics: Seinen

Akira is in the midst of the final battle between the human race and vampires. He only has 47 days until Japan is turned into an island of vampires.

(Source: ANN)