Vassalord. - Chrono, Nanae

Charley, a cyborg vampire who does the Vatican's dirty work, is the thrall of the local vampire playboy Johnny Rayflo. As the two fight crime—and each other—hilarity, violence and sacrilege ensue! But can Charley resist his own desperate cravings for blood? Find out as the devilish duo go up aginst a childlike vampire princess, a mysterious branch of the Unitarian Church...and one another.

(Source: Tokyopop)
Included one-shot:
Volume 2: Zoul Half

Vassalord. had four volumes published in English by Tokyopop from July 29, 2008 to November 30, 2010. It has also been published in its entirety in German by Tokyopop Gmbh, Italian by GP Publishing and Polish by Studio JG.