Brave, Sword and Demon King

"When you were a human, although you were not a hero, you used the sword of the hero to die with the Demon King, and then you were resurrected as the Demon King." "And I know that some things that are good at the beginning will be distorted by time into things that even the founders don't understand. It's not until later people read the information that they know what the founders really wanted to do." "So I have to live all the time to ensure that every idea I have is perfectly executed. I have collected a lot of the remains of the Demon King and want to become the Demon King." "The elves choose to use the sword of bravery to bind each generation of ancestors to achieve the optimal solution." "So... We all envy you, Demon King..."