Fujino Tetsuya, a convenience store worker and certified otaku, always dreamed of getting isekai’d into a fantasy world with overpowered abilities and a harem of beautiful women. When fate finally answered his call, he found himself summoned as the 665th Demon Lord, destined to lead an army of darkness against humanity. There was just one tiny problem—his so-called ‘ultimate power’ came with ridiculous conditions. If he wanted to use his abilities, he had to do something embarrassing first, like stripping down mid-battle or confessing his undying love to the enemy. For three years, he endured humiliation after humiliation, losing every single war to the legendary Hero, Loraine Lionheart. On his 999th defeat, Fujino finally had enough. He stood up, dusted himself off, and declared: “I quit.” Now, with the entire world in shock, the demon army in chaos, and the Hero utterly dumbfounded, Fujino walks away from the battlefield to pursue his dream of a peaceful slow life. But will the world really let the Demon Lord retire so easily? One thing’s for sure—things are about to get even dumber.