Based on the animated short of the same name.

Even mighty dragons can get cavities, and Nonoko has been newly assigned to protect the teeth of the guardian dragon of her country. One day, she discovers an enemy soldier resurrected from the inside of a dragon's tooth, a phenomenon which legend says foretells disaster. In a land ravaged by war, what does fate have in store for the dragon dentist Nonoko and her new “apprentice”? [ANN]