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 he’s 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.