Silent Witch: Chinmoku no Majo no Kakushigoto

Humans couldn’t handle magic without chanting until Monica Everett, the Silent Witch and one of the Seven Sages, made unspoken magecraft possible. Painfully shy, she enjoys seclusion. One day, Louis Miller, the Barrier Mage, delivers the king’s order: Go undercover at a prestigious school for nobles to guard the second prince. Get ready for her silent mission to begin! (Source: Crunchyroll)