Higanjima X
Genres: Fantasy, Horror
Type: ONA, Episodes: 12
Aired: Oct 15, 2016 to Mar 25, 2017
Source: Manga
Rating: R - 17+ (violence & profanity)
Synopsis:
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)