The two eldest Shinazugawa children survived their families massacre, and parted on broken terms. They each went their own way, unknowingly leaving a surviving sister among the ashes. Yeah, I'm making a They Live AU for that one minor character who appeared in maybe five panels.

On a cold, winter day, the first time Tanjiro accompanies his father to the town at the base of their mountain home, they encounter a very hungry, very angry, very lonely Genya.