A girl comes there to become a dentist of dragon. She is with other new freshman applicants, but there is no announcement from a senior as a guidance. They are confused and taken along with the senior. The only way is just to walk through freshman's path, which is dark and strange. They do not know where they are. Not knowing what to do, she is approaching to the secret of dragon, but she does not realize yet. The adventure has already begun.

People of a star similar to Earth's built civilizations on the ground of various places, like our world. They were led to the global war by evolving forces of science. But in this star, there is a secret that even residents don't know.