The story is set in the Land of the Dragon, where Nonoko, a newly appointed dentist, is on a mission to protect the dragon, the protector of the country, from the bacteria responsible for tooth decay. One day, during a series of battles against a neighbouring country, Nonoko discovers a young enemy soldier unconscious in one of the dragon's teeth. His name is Ber, and he was resurrected by the dragon inside one of its teeth: this supernatural phenomenon, according to legend, precedes a great catastrophe. Based on the anime of the same name.