Silent Witch centers on Monica Everett, a genius magician in the Kingdom of Ridill who became the first person to wield chantless magic. As one of the Seven Sages, she is powerful enough to confront terrifying threats, including the legendary black dragon, and defeat them on her own. But Monica's greatest strength is tied to an even deeper weakness: she is painfully shy, and she learned to cast spells without chanting because she would rather avoid speaking in public than impress anyone. Given the choice, she would happily remain alone on a mountain top far from society.
That isolation ends when another sage entrusts her with a secret mission to protect the kingdom's second prince, Felix Arc Ridill, after a series of assassination attempts. To keep him safe, Monica must enroll undercover at Serendia Academy, where she hides both her identity and her social anxiety behind the mask of an ordinary student. Between covert guard duty, constant nerves, and the pressure of living among classmates who know nothing of her true role, Monica faces a mission far more difficult than any spell: surviving daily life without revealing who she really is.