Sinopse: Attacked by vampires at a club, nineteen-year-old En survives after being bitten and turning into a vampire himself. He is then found by Ichii, a vampire from the organization \'FANGS\' who becomes his guardian. To satisfy the vampires\' urge to suck blood, the organization encourages a \'pairing system\' where two vampires agree to support one another. At his first pairing party, En attracts a lot of vampires due to his status as a \'virgin\', and thus declares in a panic that he will become Ichii\'s pair…?!