Higanjima is an eerie island occupied by vampires, from where none has ever come back alive. When teenager Akira hears that his missing brother has been seen in the island, he decides to investigate with several friends.

Second year high school student Kodaka Hasegawa has transferred to his new school about a month ago, but he still hasn't made any friends. Kodaka Hasegawa was born from a Japanese father and a British mother. Because of his appearance, people think Kodaka Hasegawa is a troubled kid. One day, Kodaka Hasegawa sees classmate Yozora Mikazuki pleasantly talking to herself. Kodaka Hasegawa talks with her about how to make friends. To make friends, Yozora Mikazuki decides to form the Neighbor's Club and forces Kodaka to enroll in the club.