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.

Ukishima Shrine is located in an old, picturesque lakeside town. Shrine maiden Kisaragi Saya lives there along with her father, Tadayoshi. By day, she lives the life of a normal high school student at Sanbara Academy. By night, she hunts the Old Ones. Possessing supernatural physical prowess, the Old Ones prey on humans, and only Saya has the ability to defeat them.<br><br>
(Source: AniDB)

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