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In the world ruled by the clan of the family, “Yamauchi”, the selection was started after the successor Wakamiya. The four princesses who were sent to there to compete against each other had their own thoughts and they were competing in the later seats, and various incidents occurred. And a mysterious letter ... who will eventually be chosen by Wakamiya?
In 1905, Vergille Strauss is a young thief living in the small country of Apfelland. With the help of a local inspector named Fleischer, he rescues a girl from a group of foreign thugs. Her name is Frieda and she may be the key to a secret that is of great interest to other nations.
Koperu-kun —his nickname taken from Copernicus— is a junior-high school student who learns to think for himself through the guidance of his uncle and the introduction of a number of philosophical concepts. It is also a story of friendship, bullying, and the consequences of a broken promise, as well as a commentary on social issues.