Blood: The Last Vampire

Production I.G originally created Blood: The Last Vampire as a 45-minute standalone film. It took place in the 1970s at a school near the American army base in Osaka, Japan and revolved around Saya, a young-looking, katana-wielding vampire hunter-- and the titular "last vampire" herself, destroying the peon vampires she finds. The film was popular and six years later they created a new adaptation of the same concept. This time set in present-day Osaka, Saya is living as an amnesiac, adopted by a human family and unaware of being a vampire (or chiropteran, as the series refers to them), thinking that she's simply anemic. As a pair of chiropterans attack the city, however, some of her memories are restored and she joins the mysterious Red Shield organization in order to protect the family she's come to care for-but possibly at the cost of getting to be with them.