Vassalord.

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 against a childlike vampire princess, a mysterious branch of the Unitarian Church...and one another. (Source: Tokyopop)

Type: OVA
Rating: R - 17+ (violence & profanity)
Season: winter 2013
Status: Finished Airing
Read more: MyAnimeList (MAL)
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Tags: action science fiction comedy fantasy shoujo based on a manga manga supernatural super power swordplay romance nudity horror vampire vampires gore mystery boys' love cyborg human enhancement shounen ai bl shounen-ai