Yuina and Naoki are a lovey-dovey couple. But they each have a big secret. Yuina's true identity is a special police officer who pursues "Werewolves" and "Vampires," who are a threat to humanity. Meanwhile, Naoki hides the fact that he is a werewolf. One day on a new moon, Yuina is suddenly attacked by a vampire, but is saved by a werewolf who is also her nemesis...