Trinity Blood

In a dark and distant future, Armageddon has given rise to the fabled Second Moon - and a perpetual war between the vampires and the humans! Esther is a nun in the city of Istavan. When she crosses paths with Abel Nightroad, a priest sent from the Vatican to combat the local order of vampires, the two form a holy alliance to battle the most evil of threats. In this gorgeous, gothic-action series - part of the super-popular Trinity Blood franchise - the very survival of the human race is at stake! (Source: VIZ Media)

From Tokyopop: A mysterious terrorist organization is hell-bent on orchestrating a war between the New Human Empire and the Vatican. Special Ops AX Agent Abel Nightroad teams up with a spunky young novice named Esther to try and stop Gyula, the bloodthirsty Marquis of Hungary, from unleashing the legendary Star of Sorrow.Set against a neo-gothic backdrop, this second Trinity Blood series--connected to the Rage Against the Moons series--promises plenty of action and intrigue as Esther and Abel struggle to save the lives of humans and vampires alike! *Trinity Blood Canon Summa Theologica* summarizes the incomplete further story based on the author´s notes but doesn´t feature the final conclusion.