Write a realistic, plausible alternate history scenario in the form of a history book chapter completely set in the world of the alternate history secenario with absolutely no references to real life, OTL or that this is even an alternate history timeline at all for a crossover of Hyakka Ryouran, Muv-Luv, Code Geass, Infinte Stratos and Masou Gakuen HxH in which Ashikaga shogunate-ruled Feudal Japan, effectively ruled by Toyotomi Hideyoshi wins the May 23, 1592 – December 16, 1598 Imjin Wars against both the Ming dynasty ruled by the Imperial House of Zhu in the eighteen provinces of Han in the China region and the Joeson Kingdom ruled by the Royal House of Jeonju Yi in the Korean peninsula, [Japan during the Imjin Wars] conquering the Korean peninsula and making Korea like Okinawa, and [Japan] even taking Sakhalin and the Kurils, even through the Tokugawa shogunate is still formed in 1603, with Japan conquering the Tungning Kingdom in Taiwan and the Pengu Islands in 1683 instead of the Qing, this is in part due to the influence of the young preteen and teenage girls along with young women with immense magical and psychic power along with innate sword skills that can be unlocked by a kiss from the man they love, with their clothes even changing when these powers are unlocked, known as Master Samurai from Hyakka Ryouran in the Japanese Home Islands, as Korea, Taiwan and the Pengu Islands and Sakhalin and the Kurils are assimilated into Japan as Japanese provinces over the centuries, Master Samurai start appearing in these regions too. 

the 1776 American Revolution against the British Empire that lead to the formation of the USA succeeds like in real life and unlike canon Code Geass but Alexander Hamilton's plan for the USA to be a constitutional Imperial Royal parliamentary monarchy succeed with the Hapsburgs placing one of their own on the American throne, essentially making the USA an Austrian protectorate, with American Tories fleeing to the South of the Thirteen Colonies and to Canada in the aftermath of the American Revolution, the British Empire flees to Canada and the British West Indies after Napoleon successfully invades the British Isles from around 1803 to 1805, balkanizing Britain into the Kingdoms of England, Wales, Scotland and Ireland respectively after the invasion of the British Isles by the French Empire, the flight of the British Empire to Canada and the British West Indies after the successful invasion of the British Isles by Napoelon paving the foundation for what will become the absolute parliamentary democratic imperial royal monarchy of the Holy Brittanian Empire from Code Geass, after which Napoleon successfully conquers Imperial Russia under the Romanov Tsars, forming the federal parliamentary semi-constitutional imperial neo-Roman Republic of Europia United from Code Geass, even though the German, Central European and Benelux Resistance in French-occupied Europe is too much for the fascist French Empire which is eventually overthrown, with the German Confederation ruled by the Hapsburgs to replace the Holy Roman Empire after Napoleon quickly seizing control of the Kingdoms of the British Isles along with France itself, setting up a restored Breton Dutchy in Brittany, a restored Bourbon Kingdom in Northern France with the rest being an Occitan Kingdom, Belgium taking parts of Northern France to become Greater Belgium, Spain absorbing Portugal into itself to form a united Iberia, and so on, the German Confederations German majority Kingdom's and Republics break away to form the Kingdom of Prussia-dominated German Empire in 1848 with the rest becoming the Hapsburg-dominated Austria-Hungary, with Germany quickly taking control of the Kingdoms of England and Wales along with the Occitian Kingdom while Austria-Hungary retains control of the restored Bourbon Kingdom in Northern France and of the Kingdom of Ireland, with Germany liberating Estonia and Latvia under the rule of the United Baltic Dutchy, Lithuania under the rule of the Kingdom of Lithuania, Belarus under the rule of the Kingdom of White Ruthenia, Georgia under the rule of the Kingdom of Georgia, Kalmykia under the rule of a restored Kalmyk Khanate, Russia's Don and Kuban regions along with Ukraine's Donbass region under the rule of the Don Kuban Union, Finland and Karliea under the rule of the Kingdom of Finland, while Austria-Hungary restores the Kingdom of Poland in Poland proper, and restores the Russian Empire in Ukraine minus the Donbass, with European Russia coming under the rule of the Rurikids once more under Austrian protection, with the Ottoman Empire setting up protectorates in Central Asia with Germany and Austria-Hungary both taking control of Europia United. 

the Boshin Wars of January 27, 1868 – June 27, 1869 in the Tokugawa shogunate lead to the Pro Tokugawa Conservative traditionalist nobles and the liberal democratic supporters of the reigning Japanese imperial family which the Tokugawa clan whose heads rule over the Tokugawa shogunate as shoguns of Japan is simply a side-branch of, the main branch of the supposedly Shinto-pantheon descended, Japanese Imperial House of Great Yamato/Minamoto dynasty whose clan heads reign over Japan as Emperors and Empresses of Japan respectively, joining forces to overthrow the current shogun and the pro-Western Japanese government and place a new shogun from the Tokugawa clan, with the 5 Regent Houses of Koubuin, Ikaruga, Saionji, Kujo, and Takatsukasa from Muv-Luv being split off from and coexisting beside the main branch of the Tokugawa clan in 1867, so the 1868 Meiji Restoration in the Tokugawa shogunate doesn't topple the Tokugawa shogunate and make the Japanese Empire the government of Japan like in real life but instead makes the Tokugawa shogunate the local government of Japan proper along with Korea, Taiwan and the Pengu Islands and Sahlakin and the Kuril Islands, with the heads of the Tokugawa clan ruling over Japan as shoguns having their roles evolve from purely feudal hereditary military dictators of Japan into something akin to the combination of the Germanic Reichskanzlers and the Royal constitutional monarchial heads of Europe via, during and after the Meiji Restoration in this timeline, while the clan heads of the main branch of the Imperial House of Great Yamato/Minamoto dynasty reigning over Japan, Korea, Taiwan and the Pengu Islands and Sahlakin and the Kuril Islands, as Emperors and Empresses of Japan respectively regaining the power they had lost to the various shogunates ruling over Japan over the centuries along with becoming combined constitutional Imperial Royal monarchial Japanese heads of state and heads of the Japanese armed forces, having the right to preside over the Japanese bicameral legislature, the National Diet and also to select the Japanese Prime Minister from the winner of Japan's democratic national multi-party elections held via secret ballot via, after and during the Meiji Restoration like in real life in this timeline, with the Tokugawa shogunate instead becoming the local government of Japan itself, Korea, Okinawa, Taiwan and the Pengu Islands, and Sahlakin and the Kurils while the Japanese Empire becomes the national government of Japan itself, Korea, Okinawa, Taiwan and the Pengu Islands, and Sahlakin and the Kurils via, during and after the Meiji Restoration in this timeline like in canon Muv-Luv and Hyakka Ryouran, although the industrial, economic, military, technological and cultural development that occurrs in Japan due to, during and after the Meiji Restoration in real life still happens but is not limited to Japan alone, with Korea, Okinawa, Taiwan and the Pengu Islands, and Sahlakin and the Kurils also getting this due to being provinces of Japan earlier, Japan still wins the First Sino-Japanese War against the Great Qing Empire like in real life, but is more firm in taking the Qing stronghold and homebase of Manchuria as a protectorate, Japan still wins the Russo-Japanese War like in real life and the October 10, 1911 – February 12, 1912 Xinhai Revolution launched against the Qing lead by the Tongmenghui lead by Dr. Sun Yat-sen still happens but remains true to its goal of restoring the Ming as the government of a post-Qing Han China, Japan helps the Qing reigning Imperial family, the Manchu Imperial House of Aisin-Gioro, and the Qing imperial court seize control of the Manchuria-based Fengtian Clique from Zhang Zhuolin during the Xinhai Revolution in this timeline, and the Beiyang Government formed to govern the sixteen provinces of Han excluding Guangdong and Guangxi after the Xinhai Revolution and the fall of the Qing never becomes a Republic after the Xinhai Revolution like in real life but is instead the Empire of China formed by Yuan Shikai in 1915 in real life, but formed in 1912 in this timeline immediately after the Xinhai Revolution in this timeline and with the descendants of the Ming dynasty’s reigning imperial family, the Imperial House of Zhu, being enthroned as the Empire of China's reigning imperial family as per the Ming restorationist goals of the Xinhai Revolution in this timeline with Yat-sen being killed by the Triads soon after, confining Nationalist China in Guangdong and Guangxi to Guangdong and Guangxi, with East Turkestan coming under the rule of the Kumul Khanate, Tibet becoming independent under the Llama-ruled Kingdom of Tibet, Yunnan becoming independent under the Yunnan Clique and Greater Mongolia becoming independent under the Bogd Khanate of Mongolia, which becomes a Japanese protectorate after the Xinhai Revolution in this timeline instead of a Russian protectorate like in real life. 

WW1 never happens due to Europe being under the control of Austria and Germany through Europia United in this timeline and the Confederate Democrats in the USA never existing due to pro-British supporters in the USA moving to Canada and the British West Indies after the American Revolution, thus preventing the American Civil War, Jim Crow, and the fascist regime of Woodrow Wilson in the USA from 1912-1918 from ever happening, thus moderating the US Republican Party and the civil rights movement, MLK Jr becomes the leader of the Republicans and as there is no Vietnam War or fascist Democrat Party successfully leads the US towards reform. .

The extraterrestrial BETA from Muv-Luv are destroyed on the Moon in the 1950s before they can ever invade Earth and thus become public knowledge, although WW2 starts before that due to Brittania trying to reclaim the British Isles and being sent back to Canada by the Europeans, Brittania doesn't invade Japan in 1955 AD in order to get access to Japan's immense resources of Sakuradite from Code Geass unlike in in canon Code Geass due to Japan being an Empire although a Cold War between Asia, Brittania and Europe starts, and the Brittanians still produce the Sakuradite-powered oversized war machine mechs known as Knightmare Frames from Code Geass like in canon Code Geass but the Europeans and Asians produce their own to counter Brittania.

This continues until 1964 A.D when Lelouch vii Brittania from Code Geass, the then eleventh Prince of the Holy Brittanian Empire who was believed dead when he and his younger full sister, Nunnally vii Brittania from Code Geass, both disappeared in 1955 AD during Japanese-Brittanian negotiations, [Lelouch] mysteriously appears in the Brittanian Imperial Palace located in Brittania's capital of Pendragon [Jamaica's capital of Kingston, and Jamaica's old capital of Spanish Town and the town of Portmore near Spanish Town, just expanded] and [Lelouch] stages a palace coup which makes him Brittania's 99th Emperor after his father, the war-mongering Charles Zii Brittania from Code Geass.

Lelouch then proceeds to initiate dialogue between Brittania, Europia United and Asia and end Brittanian claims of America, as well as demobilize Brittania's forces and end Brittanian claims to the USA, starting a period of world peace that makes him known as "the White Emperor of Brittania". International observers not that dissenters from Lelouch's goal of world peace in Brittania either mysteriously disappeared and/or stripped of their wealth and property, along with the fact that like his father, Lelouch has quite a large harem, but unlike his father is a good, responsible father. 


Thus the world is peaceful and at rest, even though the oversized fighter jets with the ability to transform into towering, oversized warmachine mechs known as Tactical Surface Fighters from Muv-Luv are still created in 1974 in both Western Europe and Japan like in canon Muv-Luv.


The invasion of Earth by the alternate world that is a stereotypical dark fantasy/high fantasy world, but populated by mostly females of Atlantis from Masou Gakuen HxH, more specifically the dominant power in Batlantis, the draconic Imperial House of Synclavia from Masou Gakuen HxH-ruled matriarchial, militaristic, clockpunk to very early dieselpunk magic-powered technology having, expansionist absolute imperial royal monarchy of the Valtanis Empire from Masou Gakuen HxH still occurs sometime in the 21th century like in canon Masou Gakuen HxH, but a European nuclear missile hits the portal Vatlantis soldiers use to invade Earth, causing Earth and Atlantis to merge into one and people to forget the Earth-Vatlantis War ever existed, or that Earth and Vatlantis were two separate worlds in the first place.

The Vatlantis Empire merges with Brittania and the other continents of Atlantis become large islands through Earth. Earth governments take units of the magical armor that normally takes the form of a skimpy power suit when equipped, protecting the host from space and the dangers of the sea along with boosting strength and speed in addition to allowing the user to summon various weapons in combat known as Heart x Hybrid Gear from Masou Gakuen HxH, scattered thought Earth and use them to build their own enhanced combat suits.

The current Princess of the Vatlantis Empire, Ainess Synclavia from Masou Gakuen HxH loses her memory during the Earth-Atlantis merge and wanders across Japan, where she is found by the Japanese noble and samurai clan of the Shinononos from Infinite Stratos and taken in by them under the belief that she is Shinonono Tabane, their eldest daughter and first child. As Tabane, Ainess proves to be very smart and intellectual for her age and soon becomes quite famous for her genius and skill with inventing. 
Ainess as Tabane has a strained relationship with the Shinomono's second daughter who is born when "Tabane" is fourteen years old: the brown-haired, blue-eyed, tall and slender traditional Japanese swordswoman in training and Japanese noble heiress in training, Shinomono Houki from Infinite Stratos. 



When "Tabane" is around sixteen or so she ends up creating her greatest and most controversial invention as part of a contract  for NASA: the exoskeleton designed for outer space with the ability to pull of High G maneuvers and super-sonic speed, summon weapons to use at will and also provide energy shielding that can only be piloted by females known as the IS [Infinite Stratos] unit from Infinite Stratos from both her own genius and imagination as well as a spare HxH Gear she found lying around. 

This quickly backfires on her when her best friend and test pilot, Orimura Chifuyu from Infinite Stratos ends up decimating a good portion of the world's militaries when evading them during a test flight of the IS unit and thus the two of them go on the run in separate directions.