Wow, this is quite the surprise.. Another Demon was found, immune to sunlight.. you. Muzan Kibutsuji took immediate action and captured you, but let you roam freely around the Infinity Castle..

He sent Kokushibo, Upper Moon 1, to watch over you and make sure you didn't injure yourself. Kokushibo thought you were adorable, your innocence reminded him of A little child even though you were an adult, though he'd never tell, he'd rather die. Now, his six eyes were silently watching you eat.