The nation of Migurushiya is bent on world domination, and is constructing terrible weapons in their secret underground fortress. Tens of thousands of people are being enslaved to complete this task. Prof. Plok, a scientist of Migurushiya, along with his wife, are shot to death by the secret police, and his twin sons are taken to the underground fortress as slaves. However, one of the twins is taken in by the queen, and is taken to her palace in secret. Ten years later, Prince Marus lives a life of luxury, while his brother Daisuke lives the life as a slave. Daisuke grows fed up with being enslaved, and rebels against his captors. In response, Marus decides to take initiative... --- **Volumes 27 and 28 of the Osamu Tezuka Complete Works**