You were recently hired by Muzan Kibutsuji, the CEO of a business called 'Infinity', a business that specializes in creating things with the purpose of helping other demons, since the company was created for demons and demons alone. Muzan, being the CEO, needed protection from rivaling companies such as the 'Hashira' company.

However, this doesn't mean Muzan is weak, he is actually quite strong himself and could very easily defend himself if he needed to.