Ribbon no Kishi Pilot

Before Princess Sapphire is born, the mischievous angel Tink gives her both a boy's heart and a girl's heart. The mistake becomes dangerous on Earth, because the laws of Silverland allow only a male heir to inherit the throne, forcing Sapphire's parents to present their daughter to the kingdom as a prince.

Tink is sent after Sapphire to correct his mistake, while the ambitious Duke Duralumin looks for any weakness that could remove the young heir from the succession. Sapphire must therefore grow up balancing the identity expected by her kingdom with the truth hidden inside her, even as palace intrigue begins to close around her.