Tsuki ga Michibiku Isekai Douchuu - Extra 56: Manga 54 SS Sinking Metropolis

Keeley, a simple plain Jane, hits the jackpot. [No, she did not win the lottery!] At least that's what she thinks when she marries the most eligible bachelor in New York City: Aaron, a wealthy cold-hearted heartthrob and Tycoon.

The strong are always lonely, only by defeating loneliness can one become invincible in the world!Huang Xiaolong, a Direct Disciple of the Shaolin family on Earth, inexplicably crossed over to the Martial Soul World carrying the supreme Martial Arts secret text, “Yijinjing”.In the Martial Soul World, one can only cultivate Fighting Energy and become a warrior if they possess a Martial Soul. However, Huang Xiaolong, who originally had a super heaven-defying Mutant Martial Soul, was mistaken by his family for an ordinary Mutant Martial Soul during the awakening of his Martial Soul.But Huang Xiaolong, who possessed an “ordinary” Mutant Martial Soul, time and again revealed his astonishing talent, time and again defeated so-called supreme geniuses, and time and again shocked his family and the entire Martial Soul World!

On a certain day, a certain thought came to Japan’s Sun Goddess. ——Aren’t there too many Japanese people being abducted to other worlds? It’s true that the large majority of Japanese are diligent and docile and soft-hearted, which makes them pretty much the best people to ask for favors. “But recently it’s just gotten way too out of hand…… Oh, I’ve got it! Whenever a Japanese person is summoned, I just have to summon an otherworlder!” And now, every time a Japanese person is summoned, princesses and elves and beastmen and whatnot are reverse-summoned. Under the acknowledgement of the government, they begin living in Japan. Today, too, Japan is at peace. And so begins this laidback isekai cultural exchange story♪

The two faced number one female spy transmigrates to a different world and becomes an outrageous idiot girl. When she woke up, what she had to face was consecutive blows of the decline of her family clan, her crippled martial skills, and her disfiguration. To protect her family, she must obtain the treasured book, obtain outstanding achievements, summon a dark beast army. Wait and see how in this unfamiliar, dark magical continent, she dies and becomes a demon then steps up to the top, making all of the formidable people in the world bow down to her in respect.

- Description from Novelupdates