Blood-C

Kimihiro Watanuki is haunted by visions of ghosts and spirits. He seeks help from a mysterious woman named Yuko, who claims she can help. However, Watanuki must work for Yuko in order to pay for her aid. Soon Watanuki finds himself employed in Yuko’s shop where he sees things and meets customers that are stranger than anything he could have ever imagined. (Source: Kodansha USA) *Notes: \- The series was re-named to xxxHolic•Rou on chapter title pages of chapter 186 and on, but not on their volume's front covers, spines and indicia. \- The chapter count contains a one-shot published in May 2010 to commemorate the switch, which was later collected into Volume 18. \- The chapter count also reflects the magazine releases; the chapters plus the one-shot were re-arranged into 109 chapters across 19 volumes.*

A story set in the BLOOD-C universe that takes place in 1946. David, a young military investigator, begins looking into a mysterious death at the Allied Headquarters in Yokohama. There he finds himself being drawn into supernatural affairs after encountering a shadowy Japanese man with a strange sword.

From Dark Horse: At Yokota Base in Japan, American soldiers stand guard at the brink of the Vietnam War. Although they fear the enemy outside their base, an even more dangerous enemy waits within bloodthirsty vampires walk among them. Appearing human, the beasts lurk in secret among the soldiers, waiting for the moment to attack. Saya, a fierce and beautiful vampire hunter, is sent to lead a team of undercover agents whose mission is to decide who is human and who is not and wipe out the vampires before they can wipe out the base. But even though Saya is a powerful warrior whose skill with her Japanese sword is lethal, her ferocity may not be enough.

Saya, the main character, lost her memory and has been living with her adopted family. Her everyday life seems quite normal, except that she eats a lot more than she actually needs. Then one day she meets a guy named Hagi in a park. She is told that he has been searching for her, for a long time. Since then, her normal life has changed completely. (This manga series is proceeding quite a bit differently from the anime) A high school girl named Saya can not remember anything from her past. A handsome young man, Hagi, appears and something seems familiar about him. This girl is more than human with an ancient and mysterious past. She will hunt down and kill the monsters called Chiropterans.