(Year. 2048, Approximately 100 Years before the Golden Age)

Ever since the dawn of humanity and their rapid advances into endless fields of scientific studies and experiments and discoveries, the entirety of Earth itself is changing drastically with possibly no means of slowing down unless they wish to further decline in obscurity.

The first creation of energy during the industrial era would be the very first spark that would give rise to the evitable birth of more energy sources that were either safe, dangerous or both but their purpose remained the same; to serve humanity and their needs.

As the rise of energy brought forth the invention of technology, humanity expanded more and more, almost always taking and never returning the gifts that came from the planet itself though there have been concerns to the mass extraction of resources from the world.

Unfortunately, the needs and desire of the many outweighed the worries of the minorities yet the results cannot be ignored as technology continued to bloom ever so brightly and powerfully.

Villages transformed to towns and towns transformed into cities and cities turned itself into living megacities that dwarfed settlements that once had a few tens to hundred people as citizens but now, there are millions and more coming.

The growth of humanity will also spur the growth of far more organised and lawful society that humanised the people which inhabited the planet, philosophies and psychologies developed alongside more scientific minds and theories to practical techniques.

Good and evil were the basis of humanity's presence upon the world, what dictated as good and evil depends on the very actions of every human beings to the organisations that were created out of necessities and the need for order.

Governments rules and enforced law and order to quell any threats against it as well as to maintain a healthy and stable way of life for the society and community under their supervision.

However, rules and laws were not exempt from the presence of crime and illicit operations that are deemed as "evil" which only further complicated the humanity that defined mankind.

"Good" organisations existed as well as "evil" organisations and there are no shortages of people willing to fight for the law out of the kindness of their hearts and minds or against the law whether out of spite, hate, anger, malice and the perpetual greed of human beings.

Various individuals have rose and fell in the attempts to rid the world of evil and vice versa, criminals were apprehended to be judged under the eyes of justice yet the efforts expended were naught but a single drop in the ocean to truly rid the world of injustice.

Yet, despite the endless powerhouses and corporations that were growing as a result of the formation of humanity's frontier upon the Earth, few illustrious individuals remained firm in their stance for the betterment of mankind and the future of the entire world itself.

One such man was Sawai Souichiro, an individual that is a pacifist down to the very soul yet a resilient and firm rationalist in the face of dire risks and dangers against humanity.

Idealistic and optimistic, Sawai advocated for the abolishment of military conflicts across the world as well as the dismantlement of the usage and creation of nuclear weaponries and various other weapons of mass destructions.

At his very humble beginning, Sawai's pleas all fell on deaf ears as he was dismissed as nothing but an overly idealistic fool who dreamed of the impossible but not to the ears and eyes and minds of scientists who too like Sawai, advocated for the safety and future of humanity.

They gave their full support to Sawai who at the time was a simple Secretary-General of the United Nations, their willing cooperation gave rise to the appeal of connecting and collaborating with individuals all across the world as to fully respond to the growing changes on Earth.

Furthermore, the increasing appearances of natural disasters have only deepened the cooperation between countries and prompted them to improve upon themselves in order to establish a systemic rule that can benefit everyone.

As the abolishment of nuclear weapons continued, so did the development of multiple headquarters stationed worldwide and pioneered by the United Nations Defense Force (UNDF) to protect their designated countries from unexpected conflicts.

Conflicts stemming from human activities... or even alien lifeforms which has proven themselves real and were documented all across the planet and well within the UNDF that were soon brought to light to the rest of the ignorant members of the organisation.

Procedures were undertaken to ensure that the safety of Earth and that humanity will not fall against any malicious extra-terrestrial lifeforms as well as the implementations of various methods to expand humanity's reaches from beyond the planet and into the stars.

Continuous developments of technology and political to diplomatic law enforcements eventually led to the rearrangement of the UNDF into the World Peace Federation that is wholly centred around their scientific committee members.

As each years passes by, humanity receives a new implementation of social and defense structures against human-centric activities to the minor and subtle invasion attempts of alien lifeforms that is followed closely by natural disasters.

Technology came and stayed and improved on itself even more as the organisation known as the Terrestrial Peaceable Consortium (TPC) is established with Sawai Souichiro himself being its leading inspector general stationed at the Far East Branch Base.

The urbanisation and development of more scientific and defense structures have been constructed which resulted in the creation of humanity's first space station known to executive authorities as the Space Station Delta.

Additionally, Moon Base Garowa that was established at a prior time became the main site for testing experimental spacecrafts to further improve intergalactic travels within the Solar System.

While changes were being made within the stars, the Earth itself underwent a drastic change; from changing dangerous nuclear power generators with high-purity energy sources, all forms of environmentally harming energy sources were soon replaced by this widespread technology.

With the TPC successfully appealing to the world of the usage of high-purity energy generators, there comes the need to finalise the recruitment of its G-Organisation that would soon be absorbed into the TPC and becoming what is known as GUTS (Global Unlimited Task Squad).

Their tasks involved the investigation of any paranormal to unnatural activities sighted and reported throughout the world to being an elite rescue squad of civilians and important figures.

Led by Captain Megumi Iruma and closely followed by Deputy Captain Seiichi Munakata, Masami Horii, Rena Yanase, Tetsuo Shinjoh, Jun Yazumi and last but not least; Daigo Madoka.

They alone stood as the pillars of security amidst the changing times back then where darkness festered alone and readily in the shadows of the people's malice and ignorance but never have they ever fallen or faced absolute defeat against their enemies.

For they had an ally, a hero to guide and help them, a Titan of Light who will provide the brightest and most powerful wall against the darkness itself.

Thus began the War for the Neo Frontier.

==============================

(Year. 2049-2052, War for the Neo Frontier)

Technology and humanity continued growing and improving their shared potential together even against the aliens that found themselves on Earth and wrecking havoc around it.

However, unknown to everyone of that day and age is that the events that will befell them soon has already been prophesised in an ancient time long since passed and forgotten.

When a star fell from the skies and the gem within is unveiled, the world itself will be regaled a story that will forever be etched into the minds of the people who lived in the past.

A story of light and darkness, of heroes and villains, of clashing titans and monsters.

For over the course of roughly three years, widespread chaos and disorder befell the Earth despite hatred and strike diminishing with nature retaking its place on the planet... but that's when everything kicked off in the early dawn of Mongolia.

The first "Kaiju" that was prophesised to appear from the subterranean depths to lay waste upon a simple village but was successfully driven away by GUTS' quick intervention yet they fail to realise that was only the first of the first set of disasters waiting to come.

Driven by the prophecy and warning, GUTS soon set out for a land shrouded in nature for the sole being capable of combating the walking disasters known to the past as Tiga, a Titan who is only stone and statue entombed within a golden pyramid of light.

That is where Daigo Madoka found a mysterious connection between him and one of the three titans entombed in the land of Tiga, two of which were consequently destroyed because of the combined force of the earth-shaking Golza and the sky-rending Melba.

The last surviving Titan was on the verge of joining its demolished brethren but not before a desperate attempt at attacking from Daigo spurred one of the two Kaiju to target him instead, downing the aircraft he piloted and crash-landing into a fiery explosion of flame... and light.

Without any warning or knowledge, Golza proceeded to finish its job on eliminating the last obstacle standing in its way of the planet's destruction, attempting to crush the last Titan's statue into fragments beneath its foot.

But only to bear witnessed to the Titan's unexpected revival much to its shock, the same that can be said for the members of GUTS present back then who just witnessed Daigo's "death".

An ensuing battle took place that shook the entire foundation of the mountains and forest, ripping up the earth and undergrowth but ultimately, the Titan emerged victorious after slaying Melba with Golza making a quick escape.

Though a victory was earned alongside Daigo's miraculous survival from the crash, this is only the start as GUTS and TPC would soon become key witnesses to the appearances of more Kaiju.

Originating from the world itself to the space beyond teaming with extra-terrestrials, to the deep murky abyss of the ocean and darkness itself, from the unruly meddling of corrupt humans who coveted the power of the Titan who everyone on Earth came to know as Ultraman Tiga.

Yet no one knew the Titan and the GUTS member Daigo would be closely interconnected with each other, a secret that the latter would keep to himself while making sure to keep his friends and allies alive as Tiga himself.

Throughout the years he fought the Kaiju and aliens that came and went, some evil and others misunderstood or kind, working in the back with his fellow GUTS comrades until finally, the root of all darkness bore its tendrils towards the planet and mankind.

A darkness that corrupted and influenced many individuals, forcing them to wreck havoc on the world and leaving Tiga to defeat them, one such enemy was a man known to the scientific communities as Keigo Masaki.

He was someone who coveted the power of a titan which only fuelled his delusional and maniacal obsession with become a human that has "evolved" into perfection fitting to lead the human race into prosperity and a future of his own making.

A future that was twisted just as much as the titanic vessel that Keigo Masaki forcibly assimilated himself into, becoming nothing but a maddened titan of corrupted light, one that bore a striking resemblance to Ultraman Tiga himself.

The two titans clashed, the light and dark fought and one fell whilst the other stood tall, Tiga managed to emerge victorious through a gruelling duel and subsequently purified Keigo Masaki and his corrupted vessel, seemingly returning the titan to rest.

While this battle was won, there was still much to come and it will only get more and more difficult for both GUTS and Tiga to prevail through without a scratch yet every time where hopes seems lost, the Titan of Light shone bright and high and secured victory once more.

Until that thing appeared... from the depths of the sunken abyss beneath the ocean surface, the Ruler of Shadows, a Great Darkness, an Evil God responsible for the annihilation of the people from the ancient past, the monster's name was Gatanothor.

There was no other choice for TPC, GUTS and Tiga but to confront the dark tyrant head-on and leaving the entire world to watch this battle that will most definitely decide the fate of mankind.

Everything was unleashed upon the Ruler of Shadows in a joint attack by both GUTS and Tiga himself, attempting to whittle down Gatanothor's defense and strength but they had gravely underestimated the former's powers.

Waves after waves of darkness threatened to engulf the lone Titan of Light and the world itself at a frightening speed which only left one choice for Ultraman Tiga or Daigo Madoka himself before everything TPC and humanity worked for will be reduced to ruins.

A final resort that would undoubtedly kill himself by utilising all the light within Tiga as a bomb but also in hopes of vanquishing Gatanothor once and for all, there was no other choices at that very moment for the Ultraman's lifeforce is draining rapidly from overexertion and fatigue.

There was no more room for hesitation and Daigo Madoka had already made up his mind as Ultraman Tiga, for the future of mankind and the world itself, he will do what he must.

That day, humanity will bear witness to the greatest and most brilliant burst of light that tore apart the darkness encroaching upon the Earth itself, disintegrating both the Ruler of Shadows and the Titan of Light himself into nothing at mere seconds.

As a result, a pyrrhic victory was won but at the cost of the world's greatest ally and security, darkness has been vanquished and so did the last lingering remains of light.

That day marked the end of the War for the Neo Frontier and peace seemingly returned to the world as it had before... but everything had a price, for the disappearance of Ultraman Tiga and the declining rates of supernatural and alien activities gave GUTS no more reasons to exist.

Similarly, TPC is now refocusing their sights on the advancements of technology for a cleaner and more prosperous future on Earth which meant the integration of innumerable factions and individuals that are more or less divided due to differing goals.

Days turned to weeks, weeks turned to months, months turned to years and years turned to decades and it wasn't long until the people who personally bore witness to the Titan of Light's existence simply faded away one by one.

Just like that, the Titan of Light- Ultraman Tiga, TPC and GUTS as well as the history that the world knew back then vanished into the annals of time, faded and forgotten into obscurity as the heights of humanity's potential grew bigger and taller, leaving their past behind.

Leaving behind only fragmented tales of the Titan of Light as mankind indulged themselves in their own accomplishments and inventions, propelling their future into one driven solely by the creation of more technological advancements.

By the time the Golden Age began, there was none that remembered Ultraman Tiga. 

Blinded and overshadowed by the greed and desire that is continuously expanding out from humanity's need to advance again and again across the planet or even the stars themselves, the many corporations established only focused on the present and future, not the past.

One by one, remnants of what used to be the Terrestrial Peaceable Consortium disappeared either by themselves or by the hands of others as what is known as the World Government took its place as the newest enforcer of law and order for the next decades to come.

Be it good or bad or both, but their motto stands clear as day; "A World for All".

==============================

(Year. 2153, Golden Age)

Despite the massive advancements of technology especially with the creation of "Gestalt, a super-computer of unrivalled and ungodly processing speed, humanity still have much questioned left to be answered; where do they go from here? How and where did life truly originate from? How was the consciousness formed? What is at the end of the cosmos?

Lastly but most predominantly, where will human race go next?

The continuous cycle of passing down the will and life and genetics of one individual to another? Towards the conceptual ideal of eternal rebirth? Or ascend from their mortal flesh that will eventually wither and decay through self-modification of the human body?

Endless questions plagued the scientific community and the decisions they made are equally faced with immense pressure and scrutiny ranging from their own fellow scientists to politicians, public civilians, law enforcements and to the world leader themselves.

Until finally, a group of like-minded elites of the elite scientists came together as one with a grand plan designed for the betterment of mankind, the very same people who led mankind out of the "Great Depression" and marked their presence in the pages of history and time.

Once, a Titan of Light held the title as humanity's beacon of hope but no more, for now the world has many more beacons that is born out of human ingenuity and intellect.

Now with their goal realised as one, the next two decades of technological development will be primarily spearheaded by the Science Council to fulfil "Project Eden", a plan for mankind to reach the stars like never before.

The first year of development, Project Zero-Point Energy was a subsidiary of "Project Eden" which aims to implement five experimental Zero-Point Reactors worldwide to verify its reliabilities from multiple perspectives.

Soon afterwards in the second year of development and with support from the World Government's president at that time; Trillard alongside other proponents, the project itself managed to make a significant headway in progress while also beginning the theoretical verification of Zero-Point Engine.

The next year soon proved to the world that the development of the Zero-Point Engine was completed and marking the usages of Zero-Point Reactors as a solution to humanity's needs.

In the same year, a prototypical ship capable of carrying one of the many Zero-Point Engines, titled as the "Eden I" colony ship started construction which is soon completed followed closely by a year-long series of verification of its safety and validity.

The fifth year of development marked by the significant breakthrough of "Project Eden" whereas the Eden I interstellar colony ship completes its 32nd generation Space Environment Simulator (SES) verification and thus making permanent residency in space and FTL travel as a possibility.

The same year also marked the inclusion of a once halted project for interstellar navigation, "Project Orient" was another one of humanity's long-term goal of colonising the cosmos itself.

Similarly, the former site of the Moon Base Garowa has undergone renovation to better research and assemble the second-generation interstellar colony ship called "Eden II", also equipped with a Zero-Point Engine like its predecessor.

So much efforts expended with so many positive results given, humanity grew more and more hopeful of themselves and their intellect to spread their reaches into the galaxy.

Countries soon transferred the usage rights of spaceports and starships to the World Government and since then, they have gained control of all land, sea, air and space military forces which soon established the Starship Fleet as well as a large-scale recruitment for the Space Force.

The sixth year of development, Moon Base Garowa's renovation has been largely completed with an additional Zero-Point Engine testing site though some questions have been raised towards the lunar base's former affiliation with a seemingly forgotten organisation.

However, the rapid successful development of "Project Eden" easily erased any small-timed curiosities and in the seventh year, Trillard proposes the "Army Hiring Act" which listed personnel and equipment as hireable assets which passes by a narrow margin.

Thanks to the funds generated by said act, "Project Eden" could once again make a significant headway into further development which finally completed its preliminary stage and allow its core project; "Project Zero-Point Energy" to officially enter construction phase.

In the tenth year of development, thanks to the contribution made by the reformation of medical consortium, the civilian application of Gestalt to educational promotion and army reforms, Trillard is re-elected as the President of the World Government with supporters from various factions.

In the next four years, "Project Eden" would make another breakthrough as the second-generation interstellar colony ship Eden II is assembled at the lunar base Garowa and equipped with a temporary cold fusion engine which it subsequently launches successfully into a lunar synchronous orbit while awaiting the completion of Zero-Point Engine.

Which will not be long as the Science Council announces the first ignition of the Zero-Point Reactor will take place within a year, becoming a worldwide sensation of the endless anticipations from politicians, scientists, soldiers and civilians.

Yet despite all the successes... what went wrong?

==============================

(Year. 21XX, Reconquista Age)

The Punishing Virus, an uncontrollable cybernetic pathogen that infects every single living beings, animals or humans alike which originated from the ignition of the Zero-Point Reactor on that fateful day in the Golden Age.

Humans who are infected die quickly with their cellular structures breaking down and dissolving, plants and animals themselves are susceptible to the virus, thus contaminating many cities and countries and bringing death everywhere it goes.

Infected machines will have their logic circuits overtaken by the virus; they are then subsequently reprogrammed into mindless deviants whose sole objective is the absolute eradication of the human life and consciousness no matter the cost.

Safe zones became death zones, protective suits became an armoured coffin for the wearers, drones that prioritised human safety now targeted their former masters.

With the virus itself quickly spreading across the entire world, human societies fragmented and divided, people betrayed each other while some attempted to stand together against the chaos and maintain as much order as they could.

In a span of weeks, the human population of what once was billions have now reduced to a mere hundred thousands, remaining societies of human survivors moved to isolated regions of the world with low viral concentrations.

The remaining organized humans who attempted to quell the viral catastrophe were moved to the floating space station orbiting the Earth which also housed surviving citizens, the name of the space colony is known as "Babylonia". The City Among the Stars.

Many measures were created in order to counterattack the Punishing Virus, specifically the creation of Constructs, humans that have been modified into combat cyborgs that are solely made to combat an army of Punishing Virus infected machines known as the Corrupted.

Constructs also have their human consciousness stored into a device inside their bodies which allows them to share their consciousness with human commanders/authorities by using a device known as an Inver-Device which connects to an emulator called the M.I.N.D.

Essentially, it makes a Construct "immortal" as it allows them to transmit their consciousness into another new back up body frame but at the cost of memory or data loss for each reboots.

However, that is a lie, an experimental thought that has yet to be perfected.

Yet, this does not deter humanity from continuously fighting for the sake of their home, to take back their planet and its people, they will do anything to secure victory out of ignorance to the truth behind the forces pushing them or out of the light within their hearts for a better future.

Will humanity rise and prevail? Or will it fall into ruin like the rest in futile vain? Just as it almost did during the War for the Neo Frontier and the death of the Titan of Light?

It's all up to fate to decide.

==============================

I've decided to revamp the prologue since the original one was too cringey in my opinion, this is to also give a reason why Tiga, GUTS and TPC were not referenced in any way because everyone has truly forgotten about them, it's also to give a brief insight into the point where the whole PGR-verse started during Aeon Reforged.