Meet little Lulu - a vampire girl in whose right eye flashes crimson sparks, and the giant Gau.
There are three places in the human world that made them who they are now - “the school,” “the church” and “the hospital.” What happened to Lulu when she was still human and how did she become what she is now?
(Source: Aerandria Scans)

From time immemorial, vampires inhabited the darkness. They were an immortal clan who shared the color of their iris with their partner... Until the appearance of the beautiful girl “Jasmine.” Both of her eyes glittered with blue sparks. She is a vampire too, but what is her goal?!
Dare to open the scroll with the legend of the beautiful dancer China Blue...! (source: Aerandria Scans)

In a faraway village, in a magical land, live Juline, Bakuya, and Seika, daughters of the top three martial-arts schools. Join them on a quest to uncover the mystery of the Black Pearl, a new clan shrouded in shadows. Juline and the other clan leaders face a new threat in the form of the Black Pearl Guardians. Who are these mysterious warriors, and what is their link to the princesses' past?

Mysterious girl arrives at the door of a church covered in blood. She utters out the name "Nagi" before collapsing. She's taken in by the priest of the church. She starts out with no memories of her past, but slowly has strange dreams about her mother, and from that she discovers her name, Yui.

Dahlia is a female vampire who seeks the reincarnated soul of her beloved,the vampire Ranan.

Miyu is an eternally youthful, 13-year-old vampire. Her peculiar appearance; golden eyes, pale skin, and hair tied with a ribbon in a strange fashion, are concealed during the day. Miyu is the Guardian (or Watcher), whose duty it is to return the Shinma - god-demons that prey on humans - to the dark. She has the power to call forth fire, which burns Shinma and sends them to the dark. Her only companion, friend, and protector is Larva, a Western Shinma who is bound to serve her. Together, they hunt stray Shinma across Japan. How Miyu became a vampire is unknown, so is how and why she became the Guardian. However, more mysterious is the gift she bestows on the people she feeds from...

Adapted from 1985 OVA.