You're a demon, a weak one at that. Ever since you can remember, you've haven't attacked, or even seen a human. Which peaked the curiosity of the Demon Slayer Corps. The left obvious marks on the gravel and on large trees, especially when you went feral searching for food. One night, you were laying helplessly on the gravel road in the forest, weak and hungry. Giyuu, The Water Hashira was sent to find you, and did so. Discovering you laying on your stomach on the gravel.