Destruction Ten years ago, the world became a Shadow World that resulted in the death of the majority of the world's inhabitants. To save the world, 150 million mages entered the Shadow Labyrinth to clear it, but only six remain. The remaining mages finally defeat the dungeon boss Boromir Napolitan. After the battle, the six reflect on their adventure. However, the dragon's heart suddenly explodes, releasing the tremendous amount of mana it stored to destroy the world and kill the remaining mages. One of the last six, Desir Herrman, finds himself returning 13 years into the past right before the Hebrion Academy entrance ceremony. Brigitte, a professor at the school, explains the entrance exam and its objective, to clear a pseudo-Shadow World. In the school's courtyard, Desir is approached by his mentor, the second-year student and fire mage Ladoria Doriche, who brings him to the test area. Desir explains that Hebrion Academy has a discriminatory practice of putting all nobles in the alpha class and commoners in the beta class regardless of their test results, and those in the beta class are not properly educated. After passing by Elheim Trikincy, a second-year alpha class student who Ladoria despises, and being ridiculed by him, Desir arrives at the test area where he meets Romantica Eru, a comrade who died in the previous timeline.