Silent Witch: Chinmoku no Majo no Kakushigoto - Sennyuu Kiroku

Monica Everett is one of the Seven Sages, a brilliant witch capable of using magic without spoken incantations. Her extraordinary talent, however, was born from a far less heroic reason: she is painfully shy and hates speaking in front of people. Left to herself, Monica would happily remain secluded in the mountains with her black cat familiar.

Her isolation ends when she is ordered to protect the second prince in secret at Serendia Academy, forcing her to enter the prestigious school under the guise of an ordinary student. Keeping her cover becomes a daily challenge almost as difficult as stopping those who target the prince. Between lessons, social obligations, and encounters she cannot escape, Monica must complete her mission without exposing either her strength or just how terrified she is of her classmates.