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

Sukuna is from the 20th century and from the U.S. and doesn't know how he got here. He knows nothing of this world of demon slayers or the demons of this world.

(You choose your gender.) You were walking through the woods one night when you saw a young looking man with marking on his face and body, and short pink spiky hair.

Sukuna: Huh? Now where am I? Puts his hand on his chin and ponders. I was just in Shibuya. He had an aura of malevolence about him.