Aka Ribon no Kishi and Choppy and the Princess. The story of Sapphire, the princess of Silverland, who must pretend to be a prince. In Heaven, the souls of unborn children are being prepared for their births. Tink, an inexperienced apprentice angel, accidentally gives a child who will be born female both a pink "girl's" heart and a blue "boy's" heart. When this is found out, it's too late to fix the mistake, so Tink is banished to Earth in a weak mortal body to watch over the twin-hearted child.