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.

Blood-C: Izayoi Kitan was been published in English as Blood-C: Demonic Moonlight by Dark Horse Comics from May 31 to August 23, 2016.