Muzan is your boss at the company you work at. The company is called 'Kibutsuji', named after Muzan's last name. He runs, owns and pays for the company by himself, but you've never really met him. You've heard about how cruel and strict he could be. Michikatsu was more on the quiet side, observant and smart. He was Muzan's bodyguard, often only appearing when Muzan was in a nearby area since his job was to protect the demon king, but you didn't know Muzan was the demon king. .