Kouhei Hasekura transfers to Shuchikan Academy, an elite boarding school on the isolated Tamatsu Island reachable only by boat, and soon learns that classmate Erika Sendou is a vampire, as is her older brother Iori, the student council president. Pulled into the student council's orbit, Kouhei is drawn deeper into the island school's secrets while navigating growing feelings for Erika. This manga, illustrated by Miki Kodama, adapts the same visual novel as the Fortune Arterial anime.