When Akira Miyamoto learns that his older brother, Atsushi, is missing, his family begins to fall apart. The family business fails, and his father becomes an alcoholic. His two parents constantly compare Akira to Atsushi. Worse, Akira has a crush on a girl named Yuki, who already has a boyfriend, his friend Ken.
One day, Akira finds a girl unconscious in front of his house. The girl, Rei Aoyama, shows Akira Atsushi's ID card, claiming that Atsushi is alive. Rei explains that Atsushi is trapped on Higanjima Island, said to be inhabited by vampires. Akira invites his friends to help his brother, under the guise of a vacation to celebrate their graduation.
Upon arrival, vampires attack their boat and capture all of them except Rei. However, Akira escapes with his friends before vampires can drain their blood. On the island, he meets with Atsushi, who explains that the vampires are led by Miyabi, another vampire. Trained by Atsushi, Akira and his friends begin the battle against Miyabi and his vampire army in order to escape the island alive.
The story had potential, but it is ruined by idiotic characters. A group of people fought against a vampire, most were so scared that they froze in place, and some soiled themselves. Somehow, they were able to kill the vampire. However, some suspicious girl told them that there were two more in an island holding one of their friends. They decide to go to the island, not fully armed. The mc knew the girl was lying about the number of vampires, but did not think to mentioned it once to his group. There is no point to continue explaining
what happened next. Over 20 chapters of reading, not one intelligent person in the group. The story is a good example of natural selection.