If you're looking for anime similar to Holy Knight, you might like these titles.
Fifteen-year-old Tsukune Aono is average in every way; he has no hobbies, less-than-stellar grades and he's even flunked his high school entrance exam. His parents have managed to enroll him in a school, but it's no ordinary school! Tsukune will be attending the Youkai Academy, a place where monsters learn how to co-exist with humans! As the werewolves, vampires, witches and other monsters are required to retain their human forms, Tsukune - the lone human - is able to avoid their bloodthirsty gazes. However, he quickly attracts the attention of a number of devilish beauties including the vampire Moka, a busty succubus and even a young witch! It seems Tsukune's average life isn't so average anymore!
Rosario to Vampire and Holy Knight share the familiar story of a female vampire coming into the life of a human boy. Holy Knight is more serious than RtV, but they both include ecchi, various types of supernatural beings, and a complicated romance. If you enjoyed one, you may enjoy the other.
Both Holy Knight and Rosario to Vampire feature a Vampire Female-Male Human couple (of sorts) and in both series the vampire unexpectedly appears in the human male's life (from their perspective at least).
Let's face it, you NEED more pink-haired vampire school-girls in your life. And when the rest of the cast is mostly female with few exceptions, the male lead is just swimming in mammeries and panty-shots. So, while the plotlines are quite different, the atmosphere of the anime is very much the same. So, if you liked one, give the other a shot.
Nightmares creep into the waking hours as Mina Tepes, childlike Queen of the damned, shockingly appears on live television to announce her plans for a colony where her blood-sucking brethren can live in peace. As pandemonium engulfs the globe, Mina reconnects with a handsome face from her past: Akira, a brooding beast whose link to the queen is both powerful and mysterious. Together, Mina and Akira will bare their fangs and fight against an ancient evil. And though the Queen and her ferocious werewolf minions vow that no human blood will be spilled, there are others of her kind who yearn to sink their teeth into innocent flesh. Can Akira maintain his fleeting link to the realm of the living while battling to protect this ruthless and royal beauty? Only one thing is certain. The world’s not ready for her reign.
Holy Knight and Dance in the Vampire Bund tell the story of a female vampire and her complicated relationship with a boy of another species. Both are somewhat dark in story and animation, but they also include some ecchi to 'liven' things up. The heroines of Holy Knight and Vampire Bund share a goal they want to accomplish, but with their romantic troubles and other supernatural creatures lurking in the night, it won't be easy. If you liked one, give the other a try.
In present-day Japan, Toshihiko Momota is member of a secret warrior faction called the Kifuuken. The Kifuuken is dedicated to destroying Shokujinji - humans that turn into man-eating monsters when hunger takes them. However, to fate's chagrin, Momota meets and quickly falls for Yuka, a Shokujinji herself! Will their love be able to overcome Yuka's insatiable appetite for human flesh, or will the couple be destroyed by the bestial tendencies of humanity?
Both male protagonists are decendents of monster/vampire slaying families. They fall in love with a monster/vampire(half) girl who they are allegedily are mortal enemies with.
In Holy Knight, the half-vampire wants to bear a child of the male protagonist, because of his genes and who he is.
In Kemonozume, the monster girl truly likes the male protagonist, and learns later that he is a monster slayer from the warrior faction.
I very much enjoyed Holy Knight, if you did too check out Kemonozume! Holy Knight is an OVA and short, but does have a manga! Kemonozume is an older anime, however I remember how fantastic the story was when I watched it, so if you liked either animes, check out the other!
Kazuya Kagami's most treasured possession in the world is the obi left to him by his late mother. The scent of cherry-blossoms infused into it helps him through his day - but he never expected it to save his life, becoming a beautiful kimono-clad girl who calls herself an "artifact spirit." Her name is Kiriha, tsukumogami of the sash, who naturally moves in with him, as he is her "owner." Throw in Chisato, his bespectacled friend, an overprotective older sister who wants to take baths with him, a busty priestess, a seductive sorceress named Kokuyoura, and Kazuya's life has just gotten a lot more...interesting.
Shinichiro Asano is a penniless high school student who decides to look for a job in order to pay his rent. His teacher suggests that he find work doing housekeeping. While working for the Shimazu family, he meets Sakuya, a beautiful girl who comes off as a bit crude and selfish. But Sakuya is also the 37th head of the Shimazu family and works as an exorcist, capturing and eliminating unwanted creatures. One day, Shinichiro accidentally frees one of these creatures and they must cooperate to recapture it.
A recap of the first three episodes of Hellsing (TV), in the animation style of the Hellsing Ultimate OVA.