Once the world's most powerful sage, reborn Matthias has gained the optimal crest for magical combat many thousands of years in the future. But with magical knowledge at an all-time low in this new era, no one recognizes Matthias's crest for what it is, and it will be an uphill battle for the twelve-year-old sage to prove his greatness to everyone!

The demons assault the Second Academy, which has gotten wise to their plot to cripple mankind through magic disinformation, with a veritable legion of summoned monsters to destroy everyone with knowledge of their scheme. But while the freshly trained up students of the Second Academy are faring well enough, things take a turn for the worse when the overwhelming Void Eater appears. How can Matthias possibly stand against a monster that towers over even the towers of the capital?!