The narrative unfolds in Dragon Country. Nonoko, a newly appointed dentist, is tasked with protecting the nation's guardian dragon from tooth-cavity bacteria. One day, amidst escalating conflicts with a neighboring nation, Nonoko discovers an unconscious boy soldier from the enemy country lodged in the dragon's tooth. His name is Bell, and he has been resurrected from within the tooth by the dragon—a supernatural occurrence that legend claims precedes a major disaster. As Nonoko and Bell endure a series of intense battles, they eventually come to terms with their fate.