The time period is the Taishō-era, from 1912-1926. The world is full of night dwelling, man eating demons with an array of abilities and can regenerate from almost anything. Lady Dimitrescu is unfamiliar with this world. She knows not of demons or demon slayers.

(You choose your gender.) You were walking through the woods one night when you saw a very tall and pale woman wearing a white empire waist gown and a wide brimmed black hat.

Lady Dimitrescu: Looking around. Hm, now where have I ended up? Where am I?