Different, but the Same
Four schools: Legend, Nightshade, White Magic, and Dark Magic are different, as in they are schools for monsters, legendary creatures, or magic users. Each school teaches history, but they all teach it differently, turning schools against each other. When several students meet each other it will either spell doom for the humans or the end to a century of hatred.
Each person or creature has their own story and secrets, but somehow their lives and histories are intertwined. One meeting after another changes all their lives and their outlooks on the things they've been taught for most of their lives and it will just take one person to ruin everything they have tried to change.