Isekai no Maou-sama, Dungeon Haishin Shoujo ni Tensei suru: Shijou Saikyou Daimaou ni Yoru Juurin Haishin no Kiroku

Luna, once the strongest Great Demon Lord in the demon world, was finally defeated by a hero... or so it seemed. When she awakens, she finds herself reincarnated in a completely different world where dungeon streaming has become wildly popular. Even more surprisingly, she has been reincarnated as a human girl! After instantly defeating the giant monsters that attack her with overwhelming power, Luna becomes the center of attention due to her extraordinary strength and lovely looks. From there, she begins her rapid rise to becoming a hugely popular streamer...!?

(Source: Square Enix, translated)