Fortune Arterial's story revolves around the male protagonist Kohei Hasekura, who transfers into a prestigious public school--an English style six-year school, serving junior high and high school students. The school, named Shuchikan Academy, is on an island, Tamatsu Island, off-shore from mainland Japan, and the only way to get there is by boat. This is a series of characters' introductions to prelude the main story.
-Mangaupdates.com

The moon and the earth are linked by a single contact point, "Mitsuru ga Sakichau Ouren Rakuniushi" where Tatsuya lives under the supervision of the Sphere Kingdom (Moon Kingdom)'s Princess Feena Fam Earthlight who is coming to stay at his home. (Source: ANN)

Kohei Hasekura is a sophomore who transfers into a prestigious public school in the style of an English six-year school encompassing junior-high and high school students. The school, named Shuchikan Academy, is on an island named Tamatsu Island off-shore from mainland Japan, and the only way to get there is by boat.
but under the peaceful surface, this prestigious academy holds a dark secret. some of its sudents are Vampires! and Kouhei will get dragged deeper, and deeper into the mystery of the school and the girls that attend.

-- Manga Updates