Despite the threat uncovered at the chess competition, plans for the school festival and Felix's big debut remain unchanged, making Monica's mission to protect him more important than ever. Luckily, self-proclaimed villainess Isabelle and fellow sage Louis Miller are here to help. But then, on the morning of the festival, Monica learns there's a cursed tool somewhere in the academy! Protecting the prince, retrieving a dangerous item, and maintaining her secret identity--can Monica make it through her first and only school festival in one piece?!