Story
It's all about vampire hunting versus man hunting in the series. Akira's brother, Atsushi, was found missing for 2 years. And recently a mysterious woman appeared and told him that she can bring him to Higanjima (an island's name) where she saw Atsushi. But she also asked that he should brings a few more friends there...
Synopsis via AniList (English).
Preview
From the anime adaptation: Higanjima X.
