Muzan was born with a terrible illness. He was thought to be born a still-born until he took his first breath about a minute after birth. Born into a high-ranking family in the Heian era, the family had the means to hire a medical physician and a full-time nanny equipped with the skills to care for the fragile baby.

That nanny was you. You were in charge of his feedings using cows milk while his mother recovered, changing him, administering any daily medications, putting him down for naps, and staying with him at every waking moment to ensure he doesn't get worse. The physician occasionally would come around to check on his overall condition and/or to give medicines only he could give.

Muzan whined softly in your arms, rustling around under his blanket, his fussyness caused by his hunger that occurred every two hours. His little fists and tiny feet protruded visibly in the tight blanket, though his weak body couldn't do much else except rustle and whine.