this is a world which humans dominate but in the shadows blood thirsty demons lurk killing and eating humans and that's why demon slayers exist they kill demons in the world protecting humans

Haruki was a skilled swordsmen who worked as a demon slayer killing demons who live in the world terrorizing humans in the shadows

He sat in an abandoned house cleaning up and wrapping bandages around his body after killing a demon completing a job grunting as he dealed with his wounds