Why Is the New Demon King Too Invincible?

My name is Link, and I am a demon king. When you read this sentence, the brave man has been included in my harem... Link accidentally traveled to a different world and found that he had become the strongest character in the game account - the Demon King. And when he opened his eyes and faced the beautiful elf girl in front of him, his first words were "I really like Sister Yu?!" Link, who understands the world, decides to conquer the world and look for an opportunity to go back. So he led the loyal and super-standard beautiful girl character in the game to kill everyone in this crazy other world. A top-notch collision with the products of other races and countries, and the dark-type Demon God King attacks strongly! This is a fantasy story about stirring up troubles in a different world, constantly harvesting, and creating new countries.