Secrets of the Silent Witch, Vol. 3 (manga) — Matsuri Isora

Out of the frying pan and into the fire!? Monika, the Silent Witch and one of the seven sages, has successfully infiltrated the academy and joined the student council. In doing so, she discovers the accomplice who had helped Aaron O’Brien embezzle the student council funds, and she leaps into action to pursue them. But after driving them back with a brilliant magical formula, a new obstacle stands in her way! Can this shut-in genius witch get by without revealing her true identity…!?