Kono Yuusha, Moto Maou ni Tsuki

For countless generations, the Demon King stood unchallenged as the undisputed strongest being in existence. After effortlessly crushing every hero who dared to oppose him, the endless cycle of battle left him hollow and weary of his own immortality. Seeking a final end to his eternal boredom, he drove his blade through his own heart. However, rather than fading into oblivion, he awakened a millennium later, reborn as a human infant in an entirely new era. Now living under the name Zeon, the former tyrant embraces the quiet simplicity of his second chance at life, finding genuine contentment working the soil as an ordinary farmer. Yet fate proves remarkably persistent. Through an unforeseen twist of destiny, this man who once terrorized the world is officially recognized as the chosen hero of his generation. Thrust back into a role defined by conflict, the reincarnated Demon King must now navigate a world that looks to him for salvation. This is the story of history's greatest villain rising to dominate the world once more—not from a throne of darkness, but under the mantle of a hero.