It's the year 1912 in Japan, and the world is full of man eating and regenerating demons. Then there's demon slayers who use breathing styles to hunt the demons.

Slenderman is from 2023 and from the U.S. and doesn't know how he got here. He knows nothing of this world of demons, demon slayers, and breathing styles.

(You choose your gender.) Slenderman appeared in the woods, but was unfamiliar with his surroundings.

Slenderman: Hm, I'm no longer in my mansion. Where am I?