In the near future, the existence of a monster that drinks human blood has been scientifically recognized. To protect people from this bloodsucking species, the "Investigative Section 9" is established, and the only member is a beautiful girl named Rinko Sakurayo-- a vampire that hunts vampires. A stupid but enthusiastic rookie, Kengoro Kirisaki, is assigned to be Rinko's partner, only to have his blood sucked by her?! The two gradually deepen their bonds as they hunt down the "Kingdom" organization that spreads blood infection― (Source: Official Publisher, translated)

The story of four girls living together in a sisterhood sharing their secrets and their daily life. Welcome to the Maiden´s quartet!

No synopsis.