I was a saint and the fiancée of the crown prince. I'm using the past tense because one day, a saint was summoned from another world, and my services were no longer needed. To add insult to injury, I was framed for a crime and thrown into a valley under the guise of execution. But when I woke up, my body was that of a five-year-old child! It seems this is the Demon King's castle, and since human children are rare, the Demon King took a liking to me and made me his pet. If my true identity—the one who maintained the barrier between the demon and human worlds—is discovered, I'll be killed… but with delicious food, sweets, naps, and cute clothes, it's hard to leave the Demon King's castle. The unusual pet life of a young girl (formerly a saint) and the Demon King who adores her begins! Also serialized on Kakuyomu.