<p>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 call

Mio and Subaru live together in a small apartment avoiding attention. While they masquerade as siblings with an age gap, Subaru holds a secret.