Secrets of the Silent Witch

Story

Monica Everett, the Silent Witch, is the world’s only practitioner of Voiceless Magic, a veritable heroine who single-handedly fended off the Black Dragon of legend. However, the young prodigy is actually…super-duper shy! Yup, turns out she only learned Voiceless Magic to avoid speaking in public. Ignorant of this, the Seven Sages have placed her on a top-secret mission to guard the Second Prince. Can Monica keep it together as she contends with both social interaction and the evils targeting the young royal?

Synopsis via AniList (English).