Starlight Glimmer finally graduates from Twilight's program, and is told to find a student of her own! Twilight recommends going to a new planet, inhabited by "He-you-mains". She tries to make a friend, but finds something more!
Frustrated with her sister's free spirit and new adventures, Luna resolves to find something new to live for, now that she is retired. The answer: A power metal band. And who better to join her on her quest than the Nightmare Knights?
Sisters are supposed share everything. Secrets, experiences, feelings, knowing silences... but sometimes first a silence must be broken for sisters to truly understand one another.