In the past more and more often bloody corpses were found near the military base. While these incidents ended up in the “suicide” file at the local police, an American special task force discovers the true cause: Teropterids—Vampires that feast on the blood of humans and mingle with the population, disguised as humans, without the public knowing. To remove this possible danger for civilians and the soldiers stationed at the military base, the special task force infiltrates Yokota High School with their only weapon: Saya, a seemingly inconspicuous 17-year-old girl in a school uniform. But appearances are deceptive: Saya is a vampire as well. And Saya is hunting—she hunts her conspecifics—in order to destroy every single one…