Princess Knight

Once known as a skilled fencer who had masqueraded as a prince in order to succeed her late father, Sapphire is now happily married to her love Franz and queen of their combined realm. After she gives birth to twins, a boy and a girl who are now equal in the royal line of succession, however, a dispute arises among the courtiers and populace over which child is the true heir. When a whimsical cherub with a familiar face is unwisely summoned to settle the matter, he allows sheer luck to rule in favor of the boy. Yet once Prince Daisy is whisked away by a cabal opposed to his ascension, the remaining Princess Violetta must embark on the same path her mother once tread to safeguard her family’s claim to the throne. Cross-dressing is hardly the end of it as she undertakes breathless adventures with a gypsy lass she meets—Emerald! (Source: Kodansha USA)

Taking place in a medieval fairy-tale setting, Princess Knight is the story of young Princess Sapphire who must pretend to be a male prince so she can inherit the throne (as women are not eligible to do so). This deception begins as soon as she is born, as her father the King announces his baby is a boy instead of a girl. The reason for this is that the next-in-line to the throne, Duke Duralumon, is an evil man who would repress the people if he were to become king, and because of this the King will go to any length to prevent him from taking over. (Source: Wikipedia)

An anthology collection revolving around a school where Tezuka's characters are the students and faculty members.

**Silverland** is a wealthy nation coveted by many powerful countries. In this land, **Sapphire**, a girl born with two souls, and **Plastic**, a child called the "Devil's Child" born without a soul, come into the world. Plastic, son of the archducal family that protects Silverland, is guided by his lost soul as he plunges headlong into the vortex of war... The master Osamu Tezuka's classic work [*Ribbon no Kishi*](https://mangabaka.org/51617) is reborn in an entirely new story...!! *Source: Comip, translated*

A reboot of Princess Sapphire currently running in Tezucomi, an 18-month special magazine commemorating Osamu Tezuka for his 90th Birthday.

The May issue of Akita Shoten's Bessatsu Shounen Champion magazine revealed on Monday that Spanish artist Kenny Ruiz (Telémaco, Dos Espadas) will launch a new manga in collaboration with Tezuka Productions based on various characters of Osamu Tezuka's manga. In the manga's story, a robot alliance rules over 90% of the universe. The knight Sapphire is troubled over the pain of non-robots, and she makes a decision, for a new future. (Source: Anime News Network)

Sapphire was supposed to be a tomboyish junior high school girl who's not interested in boys, but it all changed on her 14th birthday. Not only did she find out that she's prince Sapphire, the Ribbon Knight, but she also has to protect a country called Silver Land!?