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!