Synopsis
A boy, Allen-Lordle, who is despised as “Rakudai Kenshi“ by his surroundings. One day, he decides to leave the sword arts school and duel with his classmate, the genius swordsman Dodriel. While despairing for an unwinning battle, Allen happened to get a “100 million year button.“ !? It is “one hundred million years pressing, bound to the world of the time,“ was the button cursed