Doing a plausible world and backstory for both  the Senki Zesshō Shinfogia [Superb Song of the Valkyries: Symphogear |Senki Zesshō Shinfogia|] manga, anime and mobile game franchise  and the Mahōka Kōkō no Rettōsei [the Irregular at Magic High School |Mahōka Kōkō no Rettōsei|] light novel, anime and manga franchise, explain how the Senki Zesshō Shinfogia franchise is in fact set in the Mahōka Kōkō no Rettōsei  franchise due to many years after the global intercontinental military conflict and power bloc war within the Mahōka Kōkō no Rettōsei universe that lasted from 2045 to 2064 and started as a result of a military conflict between the post-Soviet successor state of the oligarch and KGB-controlled unitary presidential republic of the Russian Federation ruling over Siberia and the Russian Far East from Russia and the de jure Marxist-Leninist, socialist but de facto Han nationalist, Han supremacist, Chinese supremacist, Chinese Imperialist Chinese Communist Party ruled de jure socialist republic but de facto Han nationalist, Han supremacist People's Republic of China ruling [the PRC] over Han China, Guangdong, Guangxi, East Turkestan, Inner and Outer Mongolia, Tibet, Shanxi and Yunnan from [the PRC's stronghold and home base] Greater Manchuria over immigration due to global cooling starting around 2030 which was already worsened by advanced agricultural production becoming a solar-powered industry in 2020, leading to a temporary population boom [the conflict which lasted from 2045 to 2064 in the Mahōka Kōkō no Rettōsei universe] known as the Third World War [Mahōka Kōkō no Rettōsei], [the Third World War in the Mahōka Kōkō no Rettōsei universe] leads not only to the reemergence of magic in a form heavily influenced by advanced technology, many decades after this,  the current head of the Japanese noble family and ex-samurai clan of the infamous Yotsuba clan [Mahōka Kōkō no Rettōsei] of magicians, assassins and spellswords, the tall, slender, and buxom, black-haired, red-eyed, full of feminine charms and enchanting mature beauty, fearsome, skilled and powerful magician Yotsuba Maya [Mahōka Kōkō no Rettōsei] and her [Maya's] older twin sister, the tall, slender, curvy and buxom, gentle, polite, and lady-like, with perfect etiquette traditional Japanese beauty Yotsuba Miya [Mahōka Kōkō no Rettōsei], [both Maya and Miya] being [Maya and Miya] are [Maya and Miya] both [Maya and Miya] are [Maya and Miya] the secret wives of a scion of the Japanese noble family turned clan of magicians and tech moguls, the Shiba clan from Mahōka Kōkō no Rettōsei, the black-haired, blue-eyed, tall and slender, scheming and cunning crooked corporate executive Shiba Tatsurou [Mahōka Kōkō no Rettōsei] with Maya being the first to concieve after their honeymoon, [Maya] giving birth to the tall, slender, muscular, black-haired, blue-eyed, outwardly emotionless and silent but also highly intelligent, tactical and reserved Japanese noble heir, ex-child soldier, and genius inventor with the unique magic to decompose, reconstruct, and detonate matter Shiba Tatsuya [Mahōka Kōkō no Rettōsei], and Miya giving birth to to her [Miya's] first child, the black-haired, blue-eyed, tall, slender and petite, ice manipulating magic-having, loving and caring but also very possessive and devoted, formal and well-spoken Japanese noble heiress Yotsuba Miyuki [Mahōka Kōkō no Rettōsei], who [Miyuki] is [Miyuki] the same person [Miyuki] as the dark-green-black haired, green-eyed, short, slender and petite, publicly helpful and cheerful but secretly shy and reserved young Japanese noble heiress Kohinata Miku [Symphogear franchise] a year later after Tatsuya in this theory.

 Two years after Tatsuya's birth, Maya gives birth to her [Inko's] and Hiashi's second child, the tall, black-haired, amber-eyed, timid, glasses-wearing, innocent, possessing the ability of seeing the difference in colors of the spirits known as Crystal Eyes [Mahōka Kōkō no Rettōsei] young Japanese noble heiress Shibata Mizuki [Mahōka Kōkō no Rettōsei],.

Three years after Tatsuya's birth, Miya gives birth to her [Miya's] second child, the brown-haired, purple-eyed, tall, slender but also rather curvy and buxom, cute, frail and oversensitive but chipper and hyperactive, light-manipulating magic having Japanese noble heiress Mitsui Honoka [Mahōka Kōkō no Rettōsei], who [Honoka in this story] is [Honoka in this story] the same person [Honoka in this story] as the main protagonist of the Symphogear franchise, the light-brown haired, orange eyed, short, slender and petite but also curvy and buxom, cheerful, outgoing, and overwhelmingly optimistic but also hot-tempered and determined Tachibana Hibiki.

 Four years after Tatsuya's birth, Maya gives birth to her [Maya's] third child, the gray-white haired, gray-eyed, tall, petite and slender but secretly buxom, silent, quiet and reserved but also straightforward and snarky, having superior magic power, vibration and sound manipulation magic-having, Japanese noble heiress Kitayama Shizuku [Mahōka Kōkō no Rettōsei], who [Shizuku in this story] is [Shizuku in this story] the same person [Shizuku in this story] as the short, lavender haired, curvy and buxom, purple-eyed, publicly hot-headed, antagonistic and aggressive, quick to distrust others and rouge-natured personality young girl Yukine Chris [Symphogear franchise].

Tatsuya grows up with Maya in addition to Shizuku and Mizuki. and Miyuki with Miya and Tatsurou, along with Honoka until Miyuki is around six to seven years old and she [Miyuki] meets Tatsuya when she [Miyuki] is at an ordinary middle school trying to live life as a normal girl under the name Kohinata Miku and she [Miyuki] learns she [Miyuki] has a older brother [Tatsuya] and younger half-sisters [Shizuku and Mizuki].

Miyuki, Shizuku and Mizuki become fast friends and Honoka also quickly befriends both Shizuku and Mizuki. Honoka and Miyuki both quickly get crushes and eventually fall in love with Tatsuya but hide it under various guises, with Miyuki hiding it under an disguise of ice-cold elegance and respectability and Honoka under public hyperactivity and private shyness.

While [Honoka] attending a pop music concert as Hibiki when she [Honoka] is [Honoka] twelve years old, Honoka finds herself [Honoka] under attack from a horde of the monstrous creatures that posses strength and special abilities that differentiate them from normal animals, indiscriminately attacking humans and animals on sight known as the Abyss that [the mob of Abyss] have [the horde of Abyss] invaded the human world, [Honoka] using her [Honoka's] inherited light manipulating abilities to [Honoka] fight off the Abyss while [Honoka] getting innocent civilians to safety, but not before being [Honoka] rescued from a exploding Abyss by [who rescues Honoka as Hibiki] the tall, red haired, red eyed, buxom and curvy, cheerful and brave but also hot headed and determined combat enhancing power armor sourced and created from legendary relics of ancient civilizations known as Symphogear, more specifically the legendary spear of the Norse God Odin with the ability to always strike the target of the attacker regardless of the attacker's skill, Gungnir, which [Gungnir] takes the form of a skin tight, orange Valkyre style battle dress with armored cyberpunk style heel boots and steampunk style gauntlets when [Gungnir] equipped in Symphogear mode-having secret agent of the Japanese military with a cover identity as a world famous Japanese pop star Amō Kanade [Symphogear franchise], who along with her [Kanade's] partner, the Japanese noble heiress who is a tall, slender and buxom Japanese girl with blue hair and dark blue eyes, having a side ponytail on the left side of her head that is longer than the rest of her hair, which falls to just above her waist and is cut straight, who is very shy but emotionally hardened, cold, and aloof, refusing to allow emotions to overcome her and started viewing herself as a weapon rather than a person,  refusing to sign any overseas contracts, despite undergoing a successful musical career in Japan, as she now only viewed herself as a weapon who sings on the battlefield, having aspirations in becoming a musical pop star and honoring her Kazanari family clan as a swordswoman, albeit low self-esteem to back it up, who looks up to Kanade as a role model for breaking out of her shell thanks to her helpful and shining personality, showcasing that she heavily relied on her as an anchor of sorts to conceal any self-doubts, who has  the legendary sword (popularly called Totsuka no Tsurugi) used by the Shinto God Susanoo of Japanese mythology, which focuses its weaponry on blades, and has a blue theme color in Symphogear mode, equipping the user in a green and black themed skin tight body suit with white armored gauntlets and white armored boots when equipped in Symphogear mode as her personal Symphogear, Kazanari Tsubasa from Symphogear, [Kanade having Tsubasa with her during the Abyss attack]  who [Kanade] sacrifices her [Kanade's] life to [Kanade] save Honoka as Hibiki while [Kanade] having Gungnir equipped, causing a piece of Gungnir to be embedded in Honoka's heart


After [Honoka] being treated for her [Honoka's] injuries from the horrific Abyss attack at the concert, [Honoka] slowly begins to [Honoka] awaken the power of Gungnir inside her [Honoka] before [Honoka] being [Honoka] found by the semi-secret paramilitary organization of the Japanese government that manufactured the Symphogears from the ancient relics which Kanade worked for, SONG [Symphogear franchise] and [Honoka] subsequently taking  the deceased Kanade's place as a agent [Honoka] for SONG, although her family doesn't know about this.



Chris/Shizuku also becomes a Symphogear user after Honoka, [Chris/Shizuku] having the possessing Infinite regenerative properties of the Nehushtan Armor as a Symphogear along with the Norse relic Ichaival, which [Ichaival] takes the form of a bow although Chris' violent mind causes her [Chris] to [Chris] manifest various types of guns and missiles during combat.



Miyuki/Miku also later [Miyuki] becomes a Symphogear user, [Miyuki] having the legendary mirror of Chinese mythology with the properties of driving away curses and purifying bad luck along with providing a form of optical camouflage a direct feedback system with the ability to project images and information directly into the brain of its user, overwhelming killing potential and a flight ability that is unmatched, Shénshòujìng [Symphogear], which [Shénshòujìng] takes the form of a skin tight, purple accentuated white bodysuit with a Mongol style helmet and form fitting white gloves when [Shénshòujìng] equipped [Shénshòujìng] as a Symphogear.

Chris/Shizuku and Miyuki/Miku also both [Chris/Shizuku and Miyuki/Miku] join SONG along Honoka/Hibiki.

Of course Tatsuya is clueless about this and so when he and Miyuki/Miyu, who have been living on their own for a while to escape the schemes of the Japanese megacorporation which manufactures spare parts used for Magic Engineering, but their ascent to the pinnacle of CAD development and production around the globe is largely in thanks to the Silver Series, but in reality manufactures military technology for unified military forces of post-WW2 Japan, controlled by the Japanese Ministry of Defense with the Japanese Prime Minister as commander-in-chief, without offensive warmaking capabilities and thus officially limited to internal security and homeland defense, and prohibited from possessing weapons that would increase their "war potential", such as ICBMs, aircraft carriers, and bombers but with an inherent right to self-defense, the Japanese Self Defence Forces, [the JSDF] along with the JSDF’s special forces unit with a mission of infiltration into enemy territory, reconnaissance, sabotage, and hostage rescue, and conducting military operations against guerrillas or enemy commandos during wartime, the Special Forces Group, [the JSDF and SFG] and intelligence and other advanced technology for Japan’s central coordinating law enforcement agency of the Japanese police system responsible for supervising Japan’s 47 prefectural police departments and determining their general standards and policies, though it can command police agencies under it in national emergencies or large-scale disasters, under the Japanese Cabinet Office commission responsible for guaranteeing the neutrality of the police system by insulating the force from political pressure and ensuring the maintenance of democratic methods in police administration, the National Public Safety Commission of the Japanese Cabinet Office, the Japanese National Police Agency, the elite tactical unit equivalent to the US Delta Force/US CIA SOG black ops death squads of the Japanese police force maintained by individual Japanese prefectural police forces and supervised by the Japanese National Police Agency and also national-level counterterrorism unit that cooperates with territorial-level Anti-Firearms Squads and Counter-NBC Terrorism Squads, the Special Assault Team, post-WW2’s Japan’s domestic intelligence agency administered by the Japanese Ministry of Justice tasked with internal security and espionage against threats to Japanese national security, contributing to Japanese government policy by providing relevant organizations with necessary foreign and domestic data (collected through investigations and intelligence activities) on subversive organizations, the Public Security Intelligence Agency and the post-WW2 Japanese intelligence agency under the Cabinet Secretariat responsible for gathering, processing, and analyzing national security information for the cabinet, reporting directly to the Japanese Prime Minister, the Cabinet Intelligence and Research Office, which is in fact a corporate front for the Yotsuba clan even though  Shiba Tatsurou is the major shareholder and the public CEO, Four Leaves Technology from Mahōka Kōkō no Rettōsei along with the abuse that Tatsurou and his [Tatsurou's] public wife, the researcher in Four Leaves Technology who been elevated to management despite having no major accomplishments to her name, who is a petite woman of average to slightly above average height, with short, dark hair, parted down the middle with one fringe on both sides of her face and two matching hair clips on the front on each side of her head, with long and moderately thick eyebrows, whose normal wear consists of a white tuxedo jacket with mandarin collar worn over a black shirt and a white trousers, being ambitious and uncaring about anyone but herself, Shiba Sayuri from Mahōka Kōkō no Rettōsei, [Tatsurou and Sayuri] heap upon Tatsuya for [Tatsuya] simply being better than either of them [Tatsurou and Sayuri] ever will be with Tatsuya, under his [Tatsuya's] super secret engineering and hacker guise as the legendary magician and engineer Taurus Silver from Mahōka Kōkō no Rettōsei literally holding Four Leaves Technology along with the engineers, scientists and technicians at  Four Leaves Technology whom Tatsurou and Sayuri literally assigned to Tatsuya, when he [Tatsuya] was just a young boy as slaves in all but name as a means of holding him [Tatsuya] back and keeping him [Tatsuya] down but Tatsuya learning from them [Tatsuya's personal slaves] and [Tatsuya] using them [the slaves] to build up Four Leaves Technology even though he [Tatsuya] can't [Tatsuya] free them [the slaves], embarrassing both Tatsurou and Sayuri and also making Shizuku, Miyuki, Mizuki and Honoka all fall in love with Tatsuya even more then, [Tatsuya and Miyuki in the present] get an invitation to the post-WW3, post magical resurgence university handles a lot of research for Japan and important requests for national defense in Japan, whose Military Research Department created scenario’s for a simulation game and whose investigative power is very high, with gossip sites masquerading as news sites of normal media organizations can’t even begin to come close, with said University’s investigative power almost comparable to military or intelligence agencies with developers of new magic in addition to being given access to the resources of the University are also granted various privileges, but their identity is also examined in detail, founded at the old Nerima Garrison in the Japanese Home Islands after WW3, the National Magic University [ Mahōka Kōkō no Rettōsei] affiliated High Schools for the purpose of nurturing Magicians, the practitioners of modern magic, located in Hachiōji-shi Tokyo in Kantō, being a upper-level, magic institution known to send over a hundred graduates who either enter the University of Magic or enroll in a Magic Technical Institute of Specialized Higher Training every year and an elite school that churns out the largest number of excellent Magicians and Magic Technicians, First High School [ Mahōka Kōkō no Rettōsei], and [Tatsuya and Miyuki] obviously accept the offer to go to First High, Tatsuya finds himself confused that Honoka, Mizuki and Shizuka are all already attending First High despite them being younger than both Miyuki and Tatsuya.

At SONG under the identities of Miku, Chris and Hibiki respectively, Miyuki, Shizuka and Honoka all pretend to be lesbian and in love with each other to both hide their true identities and also the fact that they are all hetrosexual, heterosexual for one man only: Tatsuya, which Tsubasa is of course clueless about, amusing her [Tsubasa's] uncle:  the Okinawan superhuman mutant who is beyond human due to his strength, speed, agility and flexibility inherited fron his family, the Okinawan noble family descended from the primitive man, more specifically the giant humanoid who lived originally in the Jurassic/Cretaceous era, relying on his primal instincts and the things he learned when he was younger, similar to an animal, whose intelligence ranges from animalistic to slightly above average, whose cognitive skills and perception may seem very primal at first, but are actually as complex as an average human's, having his own code of honor, and has never wanted to eat a creature that doesn't fight with him, usually seen crying after fights with ones he deems worthy to fight or when he's about to eat his prey, as an act of respect for his opponents and their lives, being afraid of nothing but one thing: wasps, [the giant humanoid] whose proportions, size, bone structure, and posture are similar to that of a sahelanthropus,standing over eight feet tall and possesses a level of muscular development only seen in the mythical Greek Gods, with dark shoulder-length hair and a youthful face, giving him an almost innocent appearance at times, which offset by his exaggerated upper and lower canines, giving him a 'fanged' appearance,along with the ability to dislocate his jaw, allowing him to open his mouth to an enormous size, Pickle from Baki the Grappler, [the Okinawan noble clan descended from Pickle] known as the Hanma clan from Baki, who is a calm, eloquent and soft spoken along with being intelligent, intellectual and suave but also being brutal, cruel, psychotic and extremely narcissistic, being a very strong fighter and martial arts master along with being a serial rapist, serial groper and mass impregnator, having several wives, concubines and consorts under various aliases, none of which know the truth along with several victims of outright rape and/or seduction who also became pregnant with and subsequently gave birth to his babies, being unkillable by nukes or conventional weapons, thus making his current occupation a highly-paid freelance mercenary and assassin for various governments and organizations as nobody can really kill him ,being  feared to the point of the  USA granting him complete amnesty and even making a “contract” by the US president that it has to be renewed every year being  fierce and arrogant,  along with being extremely violent,  showing no mercy towards anybody, as he views mercy as a “weak” trait, living  only to fight and cause destruction to anything and everything he can, with his whole life and mindset being dedicated to nothing but fighting and growing stronger with each person he defeats, sometimes killing them,  tending to kill people if pushed or enraged enough and does not show care or remorse when doing so, also killing and raping for pleasure or satisfaction when he feels like it, facing no repercussions as even the USA is powerless to stop him, having deep resentment for the weak and does not even think it’s worth killing them, being incredibly intimidating, having a menacing aura that makes everyone around feel petrified,  whose mere presence is more than enough to make others be uncomfortable and nervous near to him, considered by people as something more than a human and more like a creature or a force of nature that goes beyond human understanding, also being ruthless, being a very arrogant man, believing and knowing that he is the most vital living creature on Earth, and he feels inclined to do whatever he wants, with no one being able to stop him, viewing everyone else as insects compared to him and sees them as “the weak”, being  surprisingly patient and almost always keeps his cool along with being stoic most of the time, often speaking only what is needed and even just what is necessary and also only silently listens to others and sometimes adds something and can keep his cool even when he is insulted, but fully being capable of living in modern society but also having access to considerable resources, most likely in the form of connections or favors from some of the most influential people in the world along with a vast personal fortune, both inherited from the Hanma clan and earned on his own, along with having sharp tastes, and whenever attending places of refining or meant for the elite of society, he can blend right in by both dress and manner, along with being erudite, intelligent, and well-read in various topics, some of which are pretty esoteric, as a result of his inhumanly high testosterone level which is higher than that of any creature on Earth, along with an extension of his arrogance,  thinks of himself as the only truly “male” specimen on the world, and view everyone else as “women” or “wimps” who are under the thumb of his dominance, no matter whether they are young, old, or biologically male or female, they are all equally beneath him in his view, being a  extremely well-built Japanese-Okinawan man standing about 6’3" and weighing about 265 pounds, with a thick neck, having a athletic frame, vast shoulders and a firm chest area and his legs are also proportionally long, with red wavy hair, thick black eyebrows, and red eyes, Hanma Yūjirō from Baki the Grappler, [Tsubasa's ignorance about Miku, Chris and Hibiki in fact being  Miyuki, Shizuka and Honoka and not being gay, but having eyes for Tatsuya amusing Yūjirō] which makes things interesting when Tatsuya discovers the existence of SONG when [Tatsuya] on a mission from the JSDF's SOG with recon from the Japanese CIRO and the Japanese PSIA and [Tatsuya] discovers Miyuki, Shizuka and Honoka, along with Tsubasa transformed into their various Symphogear outfits.

P.N: Please Note: There is no multiverse, alternate worlds, multiple worlds, dimensional crossing, or any other stuff of that sort in this timeline. Everything takes place in chronological order and occurs in the same world, in the same universe, in the same greater dimension.