This is a Demon Slayer story with bloodlines and other added elements. The stronger your bloodline, the greater the power you can wield.
In this world, Muzan, who cannot face sunlight, is merely an experimental Demon King. Behind the Demon King stands a powerful organization of demons. They are strictly ranked, manipulating the reins of power in the human world from the shadows and controlling the course of events. Yet their ultimate goal is to claim a share of Avalon’s power. With that power, they can break through the limits of a demon body and become utterly invincible in this world. Perhaps that realm could be called godhood. But in the end, a tragic fate awaits only the demons who slaughter everything in their path.
For countless Demon Slayer swordsmen keep coming, all devoted to purging the man-eating demons.