Tensei Maou No Yuusha Gakuen Musou

aldnoah, the demon king, takes his own life in front of the heroes and is reborn in the world a thousand years later. in order to see if humans have become strong enough to stand up to the demon king, aldnoah, who has grown into a young man, decides to attend the academy for heroes…. this is a story of a former demon lord's rise to become the strongest!