Monica is still in shock from the events surrounding the Spiralflame, but her next trial won’t wait. She has been chosen to participate in a chess tournament held between Ridill’s three most prestigious schools— and that includes her alma mater, Minerva’s! She disguises herself to hide from a certain someone, but not everything goes to plan… What’s more, there may be an even greater danger lurking in the competition. Has Monica’s undercover school life finally reached its end?