Secrets of the Silent Witch (Light Novel), Vol. 4

Despite the danger 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. Then, on the morning of the festival, she learns that someone has snuck a cursed item into the school! Between protecting the prince, confiscating the cursed item, and maintaining her secret identity, Monica has her work cut out for her.