Blood: The Last Vampire (2000) - A vampire, Saya, who is part of clandestine government agency that tracks, captures, and obliterates demons in a post-WWII Japan, is stationed in a military school to detect classmates, who are hiding out and are in fact, really demon in the guise of human students.
Blood C (Series) (2011) - What's left of a one very powerful clan of vampires that once had high hopes of ruling the world, but were defeated in a war, where they faced vampires from other clans and their allies, which happened to be human. The clan of vampires abducts the brother of a vampire war veteran. The vampire war veteran seeks to find his brother, who was captured and held by the opposing vampire clan in an "underground" vampire city.
Vampire Hunter D (1985) - In a distant future, which is ruled by the supernatural, a girl seeks an alliance and the assistance of a vampire hunter to destroy the vampire who bit her to ensure she won't become a vampire.
Lady Death (2004) - Lucifer's (Yes, as in Satan) daughter is burned at the stake in 15th century Sweden and plots revenge against her father, The Devil himself.
Dante's Inferno (2010) - Dante traverses the nine circles of Hell (limbo, lust, gluttony, greed, anger, heresy, violence, fraud and treachery) to find his soul-mate, Beatrice, which begs the question, is Bea Arthur his true love?
Descendants of Darkness (Series) (2000 - ?) - A "Guardian of Death" investigates a rash of vampire attacks in Nagasaki.
You can watch episode 1 below.
Hell Girl (Series) (2005-2009) - When someone wishes revenge, they are beckoned to post about it on a specific website at midnight. Subsequently, Hell Girl appears to do their bidding.
Yes, its legal, lol! Its Hulu.
Inuyasha (Series) (1996-2008) - A teenage girl periodically travels back in time to feudal Japan to help a "half-demon" recover the shards of a orb of great power.