The Brilliant Healer's New Life in the Shadows, Volume 5

After encountering his late mentor's projection, Zenos realizes he only got where he is now because he had a teacher. He and the demi-human leaders decide to start a school in the slums. Unfortunately, they quickly encounter a roadblock that seems insurmountable: how can they provide the children of the slums with proper education when none of the leaders have received formal education themselves?
Fortunately, a visit from a familiar face brings with it the perfect opportunity: Zenos has been asked to become an interim healing-magic teacher at a prestigious academy. Saying yes could be the solution to their problems—nothing beats hands-on experience, after all—or create even more problems to be solved.
Regardless, Zenos finds himself with no other choice but to accept after learning of a certain influential figure's involvement in winning him the position. And when his first day of class arrives, it quickly becomes apparent that his assignment isn't quite what it was made out to be...