Four high school students, Jun-ho, Yuuto, Jack, and Danial, are transferred to another world after opening a mysterious book that Jun-ho found from his grandfather attic. They are transported to the kingdom of Tyraldill where they are chosen to save the world. However after inspecting their classes. Danial was chosen as the remaining 3 were taken to prison as Danial can't do anything, but watch in horror as it unfold.

As this transpire, Jun-ho was still unconscienced from the teleportation as he is separated from Yuuto, and Jack as his class is a fighter class. As Jun-ho regain conscience and unaware what happened, he find himself in prison with no way out. As nothing to do and to remain calm, Jun-ho train his body and as he train, he notice he had gain some stats from practicing his martial art. Unaware that people in this world believe that class system can not raise by training your body or gain from combat. Jun-ho and the others going to unleash a storm like no other.