By order of a king of the last surviving kingdom, Reigner was summoned to a world filled with magic, monsters, and classes. The dream of every RPG and video game enthusiast. The king soon dubbed Reigner as the Hero of The World, the last hope for humanity, and tasked him to conquer an apocalyptic tower that threatened to destroy the sole surviving city. Excited to be in a world filled with magic, Reigner readily agreed, only to discover he had zero magical ability. Forced to rely on weapons and equipment, he could only watch with envy as everyone around him showed off their magic ability. After twenty seven years the hero developed a grudge against the world and those who constantly rubbed their magical ability in his face. However, that did not stop him in his quest, as he felt duty bound to save the world. When he finally reached the end of the tower he found an item that would change everything for him. A class change book that could give him access to the magic he so desperately craves. He had no idea that the change would also reset his level back to zero, undoing two decades of personal growth.