Princess Luna has been the sole ruler ever since her dear sister was forced to become Daybreaker. One day at the School for Gifted Unicorns, she gives the young unicorns a test. She didn't expect a pair of unicorns to pass the test, but she takes them both in. Being a mentor isn't going to be a breeze.

Will the two unicorns become friends despite the occasional rivalries? Or will one of them become rebellious?