Higanjima X
Japanese title: 彼岸島X
Type: ONA
Episodes: 12
Source: Manga
Genres: Fantasy, Horror
Duration: 3 min per ep
Rating: R - 17+ (violence & profanity)

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)