In the country of Goldland, it is prohibited to have a princess succeed the throne. When the queen has a daughter, she decides to raise her as a boy, and have her identity be a secret. However, Sapphire would occasionally don girl's clothes.

One day, disguised as a girl, Sapphire meets Franz Charming, a prince from another country. Not knowing the truth of her identity, they fall in love.

However, Duke Duralumin, a distant relative to Goldland's king, is plotting to overthrow him...

Note: Different from the 1963 version that was serialized in Nakayoshi. This version is shorter and does not include characters like Captain Blood.

Volumes 85 and 86 of the Osamu Tezuka Complete Works