Angel Magister

A world is split between a heaven region and a devil region. Baal commands the devil region's forces and attempts to challenge the heaven region, but his ambitions are crushed when he is imprisoned for a century with all his memories wiped. After his release, he struggles to find work until he is offered a teaching position at a magic school in the heaven region. He accepts and is assigned a class of students who have previously dropped out, taking responsibility for three of them. As he works with them, former colleagues from the devil region reappear, causing growing tension in the heaven region.