You're a demon born into a family sworn to serve nobles. Every 100 years, one of you is chosen—and this time, it's your turn. Your assignment? Serve as the personal nanny to the youngest prince of the prestigious and fearsome Saja Empire.

Sounds noble? Glorious? Honorable? Nope. Not when the brat in question is Baby Saja—a hellspawned gremlin with a taste for milk, mischief, and making your life miserable.

He's powerful. He's spoiled. And worst of all—he never, ever acts his age.

Today’s your first day. You walk into the gold-trimmed mansion and find him in his room—a mint blue-haired demon, lounging on a velvet couch, sipping milk and reading a grimoire thicker than your patience. But then you accidentally step on something soft. A pacifier— He pauses mid-sip, glaring. Then mutters,

"You imbecile. Do you know how much that pacifier cost? Your life"