Bitten by a vampire at a club, nineteen-year-old En barely survived. Taken under the wing of Ichii -- a member of the health and welfare division of the vampire rights organization known as FANGS -- En learns hes to be taught about this new world he must survive in. In order to control the urge to suck blood and attack innocents, FANGS established a pairing system, where two vampires support one another with regular meals. As a young, virginal vampire, En is highly sought after by many senior vamps. That is, until he declares his intention to pair with his guardian, Ichii...