This is the story of a former Demon Lord, once the most powerful in another world, who once again reigns supreme on Earth. Ten years have passed since dungeons first appeared on Earth. Humanity has gained superhuman abilities known as “Levels,” “Stats,” and “Skills,” and those who use these powers to conquer dungeons are called Seekers. The protagonist, Renya Kamikura, suffers from recurring strange dreams and headaches, until one day, he remembers his past life as the mighty Demon Lord of another world. To his shock, all the dungeons appearing on Earth are ones he had created during his time as the Demon Lord! With his exceptional skills, extensive battle experience, and deep knowledge of magic and dungeons, Renya quickly ascends to become the strongest on Earth, standing unrivaled against all formidable opponents. Tensei Shita Daimaou, Chikyuu ni Shutsugen Shita Dungeon o Tsukuridasu,Tensei Shita Dai Maou, Chikyuu ni Shutsugen Shita Danjon o Tsukutta no ga Zense no Jibundearu Koto o Omoidasu. ~Maou Jidai no Chishiki to Keiken de Matatakuma ni Sekai Saikyou ni Natte Musou Shimasu!~ Tensei Shita Daimaou, Chikyuu ni Shutsugen Shita Dungeon o Tsukuridasu: Maou Jidai no Chishiki to Keiken de Matataku Ma ni Sekai Saikyou ni Natte Musou Shimasu!, The Reincarnated Great Demon King Remembers That It Was Him Who Created the Dungeons That Appeared on Earth: Using His Knowledge and Experience from His Time as Demon King, He Becomes the Unrivaled Strongest in an Instant!, 転生した大魔王、地球に出現したダンジョンを作ったのが前世の自分であることを思い出す。 〜魔王時代の知識と経験で瞬く間に世界最強になって無双します!〜, 転生した大魔王、地球に出現したダンジョンを作ったのが前世の自分であることを思い出す。　〜魔王時代の知識と経験で瞬く間に世界最強になって無双します！〜, 転生した大魔王、地球に出現したダンジョンを作り出す