Summarise the following: Backstory for the alternate version of Japan this is set in, remember this is set in an alternate history scenario completely set in the world of the alternate history scenario with absolutely no references to real life, OTL or that this is even an alternate history timeline at all,:  an island nation located on the eastern rim of the Pacific Ocean, and part of the Far East Defense Line situated in the Pacific region, which is a small country but technologically-advanced nation surrounded by water and close to highly volatile volcanic activity, these natural barriers, have left it vulnerable to attempted invasion and expansionism from foreign powers


In 1867, the Tokugawa clan ruling over the Tokugawa clan-ruled Tokugawa shogunate in feudal Japan and anti-Shogun daimyo in Japan united for a common cause to overthrow the pro-western government of the Tokugawa clan-ruled Tokugawa shogunate in feudal Japan, and established the restoration of imperial rule in Japan by the post-1945 reigning imperial family, the main branch of the Hànzú-Yamato Japanese royal family, noble family and Shinto priest line and warrior clan of the Minamoto dynasty/the Imperial House of Great Yamato with a new Shogun and the 5 Regent Houses of Koubuin, Ikaruga, Saionji, Kujo, and Takatsukasa, and thus the Tokugawa shogunate remained active and has remained semi isolated from the rest of the world into the 21th century and beyond. 

When the Japanese signed a limited peace treaty in 1945 with the Soviets and the Americans at the end of World War II [because Chiang Kai-shek in this timeline was killed along with the then leader of the Zhang family-ruled Fengtian Clique before becoming the commander of the KMT-ruled Nationalist Chinese "Northeastern Army" after he, his family and his supporters were kicked out of Manchuria by the Japanese and the Manchu people in 1933, and the upper heads of the CCP by a mistimed bomb that went off during the X'ian Incident, this cripped both the jointly US-Soviet backed KMT-ruled Nationalist Chinese regime based in Guangdong and Guangxi and the UK-backed CCP-ruled Chinese Soviet Republic in Inner Han China, and as a result, Sun Yat-sen's student and [Yat-sen's] true heir who was the rightful ruler of both the KMT-ruled Nationalist Chinese regime and the Beiyang Government as the first Republic of China that the jointly US-Soviet backed KMT-ruled Nationalist Chinese regime had toppled during the Northern Expedition of 1926-1928, Wang Jingwei, seized control of the KMT-ruled Nationalist Chinese regime with Japanese help and revived the Beiyang Government as the first Republic of China, before merging both regimes into one to form the Japanese protectorate of the pro-Japanese, collaborationalist KMT-ruled Reorganized National Government of the Republic of China as the government of Han China, the Second Sino-Japanese War is finished before the USA  can make the atomic bomb and also the Japanese have liberated Mongolia and Tuva, along with the Russian Far East from Soviet occupation, the European Axis is smarter and also finishes off the American WMD program [along with Moscow, London, Richmond and NYC] with Nazi German nuclear tipped ICBMs made as part of the Nazi German wunderwaffen program, they [the Japanese] were allowed to keep their imperial government intact, although their power over the nation was lessened, compared to the post-WW2 Japanese government that was created to run the nation with a democracy system.

When the Cold War started shortly after the end of World War II, Japan was pulled in by the European Axis  to act as their main Far East base, with the island nation undergoing controlled rearmament, supported by US funding, to keep both the weakened Soviets [trapped in Siberia, undergoing warlordism and chaos] and the revanchist USA in check during the Cold War. 

The current administration of Japan is more focused on an elected board of politicians known as the Imperial Diet, with governing power mostly residing with the Prime Minister of Japan, the third highest administrative authority in the nation. 

They are responsible for most of the administrative policies of the Empire, such as the decision to deploy troops overseas, the lowering of the draft age, and the relocation of refugees and resources following Operation Lucifer.

The Imperial Diet suffered a major blow during the 12/5 Incident, where most of them were killed in the initial stages of the uprising by IJA/MDF Captain Sagiri Naoya and his forces.

 The Shogunate established a provisional government to restore order after the incident.

A branch of the government, the Ministry of Defence oversees all projects to safeguard the Empire of Japan, including operations of the IJMDF. 

Under them are also various projects and plans to strengthen the fighting capabilities of the Empire of Japan as a whole; The Weapons Technology Development Authority, responsible for the development of the EML-99X and the XFJ Plan, is one such branch of the Ministry.

Imperial Shogunate

Due to the peace treaty in WWII, the Empire of Japan was allowed to keep its imperial court intact. 

The Shogunate supports and places the Emperor/Empress of Japan from the main branch of the Minamoto dynasty/the Imperial House of Great Yamato as its highest authority, and has its own armed force, the Imperial Japanese Royal Guard, to ensure the security of the Shogunate and the Emperor.

 The current Shogunate draws its candidates for the position of Shogun from the Five Regent Houses of Koubuin (煌武院), Ikaruga (斑鳩), Saionji (斉御司), Kujou (九條), and Takatsukasa (崇宰), noble families who were descended from the ruling Shogun's clan prior to the 1900s.

 So far, two Shoguns have been known by name; Saionji Tsunemori (斉御司 経盛)[1] served during the 1998 BETA Invasion of Japan, while the most recent Shogun is Koubuin Yuuhi.

The Regent Houses are thus amongst the highest-ranking nobles of Imperial Japan, superseded only by the Emperor of Japan. 

Their rank color is blue, with the appointed Shogun donning purple. Each of the Regent Houses also have their own independent security units, which can usually be identified by the red garb they wear.

Under the Regent Houses are the fudai, hereditary vassals with many generations of direct service to the Shogun, and by extension, the Regent Houses, under their name. Many of them serve in important positions; Takamura Masatada, for example, and the Takamura family in general, were prominent fudai responsible for several weapon development projects. The fudai wear yellow as their rank color.

One rank under the fudai are the samurai families, who wear white as their rank color. Most serve under the fudai as their direct subordinates.

The last rank of those serving in the Royal Guard and Shogunate are those not related to the samurai families, and thus do not have any actual status or nobility within the Shogunate. They wear grey as their rank color.

Sociopolitical, economic and military status of this version of Japan = Well think what if the 1868 Meiji Restoration made the Tokugawa shogunate the local government of Imperial Japan while the Japanese Empire was the Japanese local government, and this version of Japan survived WW2 territorially intact [no Nanking Masscarse or war crimes in China] and held on to all of its protectorates in East Asia and thus never lost Korea, Taiwan and the Pengu Islands and Sakhalin and the Kurils as provinces of Japan post-1945-1949 like OTL, and also went through the post-1950s to mid 2000s Japanese industrial, technological and economic boom like OTL Japan but also had no "Lost Decade", while the USSR lost European Russia, the Baltics, Eastern Europe and the Caucuses to a post-WW2 victorious European Axis, never got it back and was stuck in Siberia, while the USA, Russia and the UK were the ones nuked by Germany instead of Japan like OTL, Germany did an intense "decommunization" and "deRussification" of European Russia, the Baltics, Eastern Europe and the Caucuses after WW2, while the USA is just divided between low intensity warfare 

Defence Forces of this version of Japan: The armed forces of the Empire of Japan are some of the more war-experienced militaries that have fought against the BETA. Since the 1990s, Japan's military forces have been involved in various operations both abroad and local; examples include Operation 6/9 and the evacuation of Gwanju for the former, 

Currently, the armed forces are split into several distinct branches; the Imperial Japanese Army/Mainland Defence Force, the Imperial Japanese Aerospace Force, the Imperial Japanese Navy, and the Imperial Royal Guard. In particular, the Mainland Defence Force and Imperial Guard's roles in the defence of Japan have influenced the strategic goals of the nation as a whole.

The Empire of Japan's role in the Far East Defence Line is similar to that of the United Kingdom's and the Greater Germanic Realm's/Empire's [in this world, after the death of Adolf Hitler in the 1960s, Nazi Germany split into a restored German Royal House of Hohenzollern-ruled Kingdom of Prussia-dominated German Empire in the North, a restored side branch of the main branch of the Swiss-Austrian House of Hapsburg-ruled Kingdom of Poland in Poland proper, and a rump Nazi German state primarily focused in Greater Austria that seized Greater Hungary after the death of Horthy, integrated the Italian-Nazi German protectorate of the side branch of the main branch of the Italian royal family, the Franco-Spanish-German House of Savoy-ruled, Ustasha-governed Independent State of Croatia ruling over both Croatia, Bosnia and Herzovigina into itself and also took all of Tyrol back from Italy, and managed to maintain control of the German protectorate of the Government of National Salvation-ruled Territory of the Military Commander in Serbia in Serbia proper, Serbia became the Kingdom of Serbia again and rreturned to the rule of the pre-1903 Serbian reigning royal family, the pro-Austrian Serbian House of Obrenović, the rump Nazi German state in Greater Austria exercising control over the Austria-Hungarian territory returned to the rule of the Holy Roman Imperial and later Austrian, and finally Austria-Hungarian reigning imperial family, the main branch of the House of Hapsburg, restructured itself using Franz Ferdinand's United States of Greater Austria plan into the Hapsburg-ruled Danubian Federation, and managed to gain control of the Nazi protectorate of the Wehrmacht-governed Military Administration in France occupying Northern France, moving the Military Administration in France towards a restored main branch of the French House of Bourbon-ruled Kingdom of France, the Nazi German protectorate of the French State/Vichy France in South France became a restored Napoleonic French Empire ruled by the side branch of the main branch of Bourbon, the French House of Bourbon-Orléans as its reigning imperial family, which is a protectorate of the restored Hohenzollern-Prussian-dominated German Empire, Brittany, which was split from France after WW2 as a protectorate of Nazi Germany, becomes a dutchy once more and is also a protectorate of the restored Hohenzollern-Prussian-dominated German Empire, the restored Hohenzollern-Prussian-dominated German Empire also got European Russia, the Baltics, Eastern Europe and the Caucuses from the long gone Nazis and maintained the protectorate status, but restored the Romanovs in European Russia, the German House of Urach-ruled Kingdom of Lithuania in Lithuania, fufiled the German WW1 plan of creating a side branch of the main branch of the House of Hohenzollern-ruled Kingdom of White Ruthenia in Belarus, restored the German House of Meckelburg-ruled United Baltic Dutchy in Lativa and Estonia, restored the Kingdom of Georgia in Georgia under the Savoys, restored the Kalmyk Khanate in Kalmykia, created the Swedish House of Rurikid-ruled, Cossack-dominated Don-Kuban Union in Russia's Kuban region, Ukraine's Donbass region, Russia's Rostov Oblast, and restored the Ukranian House of Skoropadskyi-ruled Ukrainian State, sometimes also called the Second Hetmanate in Ukraine minus the Donbass region, and restored the German House of Hesse-ruled Kingdom of Finland in Finland and also gave Russia Karliea and the Kola Peninsula to Finland, Denmark was annexed into Germany along with Norway, Sweden became a German puppet state, the Hapsburg-ruled Danubian Federation is officially known as the Greater Germanic Reich] strategic location and purpose on the European front, and as such both nations maintain a close relationship in terms of military cooperation and tactics sharing. 


Imperial Japanese Army/Mainland Defence Force
An army by any other name
Imperial Mainland Defence Force shoulder patch.

Collectively representing all land-based combat forces of the Empire, the IJA/MDF's main mission is to safeguard the Empire of Japan against the BETA in all land-based operations.

The Imperial Army was the primary branch of the Empire's land forces, and the primary representative of Japan when it came to joint operations with the troops of other nations. At that time, the Army was split into the Mainland Force, for home defence, and the Continental Expeditionary Forces, which carried out overseas operations.[3] Examples include Operation 6/9, as well as thinning operations on the continent of Eurasia. Their force structure includes direct assault forces such as TSFs and battle tanks, combat support forces, and air support forces such as combat helicopters and transport aircraft.

Following the 1998 BETA Invasion of Japan, the Imperial Armed Forces began to move towards the Mainland Defence Force concept to deal with the restructuring of the Far East Defence Line. This new organization is closer to that of a combined task force, with forces drawn from all branches of the military to contribute to the defence of the nation. As such, it falls under the scope of responsibilities of the Imperial Armed Force's General Staff, with secondary joint command shared by each branch of the Imperial Japanese military. Unlike the old Army structure which split the force into the Mainland and Continental Expeditionary Forces, the IJ/MDF have their forces split into the North, North-East, East, Central, and West regions.[4]

However, while the Imperial Army and the Mainland Defence Force exist side-by-side, they are not the same organization, or even under the same command; it would be better described as both organizations just happening to share the same type of units most of the time, as the MDF's purpose was to improve reaction times against a BETA assault from the Asian and Eurasian continents, by forming a force structure that could accommodate speedy integration of various units from all three branches of the Japanese military. Navy and Aerospace Force units are frequently directly incorporated into MDF command structure when required, as opposed to the separate branches of land, sea, and air as seen in the Imperial Armed Forces at large, prior to the formation of the MDF.[4]

Japanese Continental Expeditionary Force
An Imperial Army unit intended for overseas operation for a specific purpose or mission. 


Atsugi Base
404th Tactical Armored Battalion
Akeno Base
133rd Regiment (2001)
An Imperial Army unit that participated in Operation 21st as part of Whiskey Unit. Cracker Platoon, Isumi Akira's previous unit, was a part of the 133rd Regiment.
31st Tactical Armored Unit (2003)
Lightnings Squadron
A unit operating F-15Js, commanded by Lieutenant Isumi Akira. With the callsign of Lightning, the squadron saw action during Operation Sledgehammer as escort units for the 26th Logistics and Service Battalion during the infiltration and takeover of the Cheorwon Hive.[5]
Camp Asaka
1st Capital Defence Division
Many of the Mainland Defence Force's units are arranged in division level, with the 1st Capital Defence Division tasked with the protection of Kyoto. As such, being assigned to such a unit is usually considered a prestige.
1st Tactical Armor Regiment
A unit of the 1st Capital Defence Division, their primary machine is the Type-94 Shiranui.
Chofu Base
Fuji 1st Base
IJA Fuji Tactical Fighter Training Group
An aggressor training unit, the Fuji TFTG is staffed with elite pilots of the IJA/MDF.
Naha Base
Ogura Base

Soumagahara Base
Steel Lance Armor Regiment
5th Division
12th Division
Contains 3 TSF regiments, as well as various armor and vehicle forces.
Imperial Japanese Aerospace Force
Following the introduction of the Laser- and Heavy Laser-class, the Imperial Air Force was merged with the Empire's space forces to form the Imperial Aerospace Force. The IAF possesses several HSSTs which were provided by the United States Space Corps, as well as most of the former Imperial Air Force's aerial assets. In addition, the IAF retains its own Orbital Diver force, and plays a larger support role by operating several sweeper and construction ships for clearing space debris, as well as the construction and maintenance of orbital station assets.[6]

Atsugi Base
IJASF 671st Airlift Group
Assigned to the Mainland Defence Force. They participated in the 12/5 Incident, using their An-225s to airdrop Type-94s of the 1st Tactical Armor Regiment, forming an encirclement around the 66th Tactical Armored Battalion Hunter and the 207th Tactical Armored Platoon to prevent their escape.
Imperial Japanese Navy
As its name suggests, the Imperial Navy has full command of the naval forces of the Empire, and given its size and assets, the organization is regarded as the third strongest navy in the world. They often work closely with the IJA/MDF to head off BETA assaults on the Japanese mainland, and possess the most firepower in the entire nation; their modernized battleships are regarded as the world's strongest ships of that class. [7]

Currently, the bulk of the fleet is concentrated in the East China Sea and the Sea of Japan, to defend Japan from incursions from KMT rebels When not in combat operations, their primary role is maritime transport and logistics for TSFs and TSAs.

Incorporated into the Navy are the Imperial Marines, who operate the TSAs and TSFs permanently attached to the naval fleets.

 They are often the first units to land in amphibious assault operations and have the crucial objective of establishing a beachhead and securing a landing area for the Imperial Army. Because of this very dangerous assignment, the Marines are often considered to be among the elite of eishi.

IJM 19th Squadron 

Salamanders Squadron
A squadron of TSFs in the Imperial Marines. 
IJN Grand Fleet 1st Fleet
Yokosuka Naval Base
1st Squadron

Kii
Owari
The Owari is the flagship of the Imperial Navy's 2nd Fleet.
Izumo
The Izumo is the flagship of the Imperial Navy's 6th Fleet.
Maidzuru Naval Base
2nd Squadron

Supported Whiskey Unit forces during Operation 21st. 

Shinano
Mino
Kaga
3rd Squadron

Supported Echo Unit forces during Operation 21st.

Yamato
Musashi
8th Squadron

Pursued the remnants of the BETA force from the Defence of Yokohama Base. The naval squadron lost them when the BETA retreated within laser range of the Cheorwon Hive.

Sasebo Naval Base
2nd  TSF Transport Squadron

Shimokita
Submarine Unit Squadron

Kasashio
Commanded by Captain Oota Chihaya during Operation Sledgehammer, callsign Orcinus-1.
TSF Transport Squadron

Ookuma
Takao
Kunisaki
Sea of Japan Squadron

Yuugumo
Kure Naval Base
IJN 4th Tactical Armored Unit

IJN 17th Tactical Armored Unit

A unit of A-6Js, they were present at both Operation 21st and Operation Sledgehammer.

Stingray Squadron
Led by Captain Yazawa Seiji during Operation Sledgehammer, callsign Stingray-1.
Salamander Unit
Present during Operation 21st.
\
Imperial Japanese Royal Guard
A military arm of the Empire staffed mostly by aristocrats and Japanese of royal lineage, the Royal Guards serve as the guards of the Shogunate. The smallest of all the military branches in the armed forces of Imperial Japan, the Royal Guard's main force are equivalent to two divisions of personnel, which are further split into four regiments's worth of people; three of the regiments are the 1st, 2nd, and the 24th Guard Regiments, with the various independent security units of the Regent Houses making up the numbers for the last regiment of personnel. 

Deployed equipment is all procured independent of the Empire of Japan's other armed forces, as according to the traditions of the Royal Guard;[8] in recent times, their equipment is also scaled according to the rank of its assigned user.

Answering directly to the ruling nobility rather than Ministry of Defence, they are a separate arm of the military dedicated to the security of the Shogun, the Regent Houses, and the legitimacy of the shogunate alongside the Japanese government.

 Despite their traditionalist tendencies, the Royal Guard does promote inter-branch cooperation within the military, and frequently engages in personnel exchanges with the Imperial Army/Mainland Defence Force if the need arises.[8]

As the primary security of the Shogunate, any threat to them, their seat of power in Kyoto or the assets they have around Japan will result in the mobilization of the Royal Guards against said threats, whether 

Shirogane Takeru, a non-nobility member of the Guard. Gray-Orange uniform.
Shirogane Takeru, a non-nobility member of the Guard. Gray-Orange uniform.
1/8
1st Guard Regiment
The unit took heavy losses during the BETA Invasion of Japan in 1998.[8]
2nd Guard Regiment
Fought alongside the 16th Guard Battalion during the 12/5 Incident.[8]
3rd Guard Battalion
A unit under the command of Takatsukasa Kyoko of the Regent House of Takatsukasa, callsign Hydra. They were present at the Miho Bay Skirmish on May 26th, 2000, in a defensive action against a BETA incursion.
Camp Kitanomaru

16th Guard Battalion
A Takemikazuchi-focused battalion of the Royal Guards, with an illustrious service history dating back to 1998.
Yokohama Base
19th Independent Guard Flight

One of the personal TSF guard units of the Regent House of Koubuin, the 19th are led by Lieutenant Tsukuyomi Mana; their orders come directly from the Shogun, and the 19th answer to no one but the Shogun. They use the callsign Blood. While the 19th are usually stationed in Yokohama Base, they also participated in Operation 21st as part of the 16th Guard Battalion.
Chofu Base

White Fang Squadron
A squadron in charge of test and evaluation of experimental technology working in cooperation with the Ministry of Defence. Their commander is Lieutenant Takamura Yui, with Lieutenant Amemiya as her second-in-command. The squadron operates an unknown number of Type-94s and Type-94-1Cs, as well as a Type-00F piloted only by Yui. They use the callsign White Fang. 

1st Independent Northern Squadron
A provisional squadron, callsign Migrant, led by Captain Fujiwara Kanae, a fudai of the Royal Guard. They were sent to Siberia to test the Type-00's cold-weather upgrades and low-temperature resistance post-2001, after the United Nations requested to evaluate the Type-00 for export production feasibility, and were involved in operations against the Evensk Hive.[9]

Hawaii Garrison

Horn Guard Battalion
A unit under the command of Ikaruga Takatsugu in The Day After universe. Not much is known concerning its numbers, but the unit is staffed by those in the Guard closest to the Governor General such as Makabe Sukerokurou and Shirogane Takeru. The detachment was seen to have a compliment of Type-00C's and Type-00A's, a Type-00F for Makabe, and a Type-00R for Takatsugu himself. Horn also received the experimental EML-99X Railgun for use during the JFK Hive Operation, with one being operated by Makabe and another by Takatsugu himself.