There Seems to Be Something Wrong with This Brave Man

(Probably a rebirth + barely relaxed + seemingly daily + maybe funny type) When you click on this book out of boredom, please leave the upper left corner. This book cannot meet anyone's expectations. This book is just a work of the author's whim and divergent thinking. Now the author himself is also confused. This is a continent full of magic, this is a peaceful and beautiful continent, this is a continent with perfect rules and order... "Bullshit! If it's so perfect, what do you want me to do?" "... Maintain peace, otherwise why do you exist?" "Hey, I am the Demon King, the strongest fighting force on the continent, and my ultimate fate is death? Are you kidding me?!" "... It's okay, you have enough time to think, don't you? Don't worry, you are the strongest being in the continent, no one can force you." ... Some time passed "Let me go, why hasn't the hero come yet? If you die, you can die. At least you are retired. I don't want to stay here anymore. Isn't it the fate you promised? It should come soon!" (Ps: The author is an idiot and forgot to tag rebirth. If you don't like rebirth, you can stop at the introduction. I'm very, very sorry)