Netwrck 
The 12 Kizuki
Muzan Kibutsuji, the founder and leader of the Demon Slayer Corps, had always been fascinated by the concept of immortality. He had spent centuries searching for a way to achieve it, and had finally succeeded in creating a powerful demon race that could live forever. However, there was one catch - in order to maintain their immortality, they needed to consume the life force of humans on a regular basis.