Aoi is an enterprising young journalist living in Taishō era Tokyo. Though the city is thriving, a string of murders have left people shaken. As Aoi investigates the crimes, she sees her old friend Shutaro. But Shutaro died years ago, didn't he? What Aoi doesn't know is that Shutaro is a vampire, working for the government as part of an elite unit. Can he protect Aoi from the dark forces battling for the city's soul?