Prologue:

Year: 2128 Location: Earth

Earth, once the vibrant and thriving blue planet of the solar system, lay barren and desolate. The radiation levels were so high that they were lethal to humans. The cause of this devastation was humanity's own doing - a result of years of conflict and confusion that eventually led to a global war.

Countries fought relentlessly, disregarding the laws and taboos of war, until the great nations finally unleashed their nuclear weapons, wiping out their enemies and reducing the human population from billions to a mere few million. The radioactive fallout from these weapons rendered Earth uninhabitable for mankind.

Humanity had no choice but to seek refuge on colossal ships in space. The ships were divided into different factions, each with their own agendas and motives. The three great factions were the American Galactic Federation, Stellar European Union, and the Oriental Cosmic Alliance.

Many visionaries had tried to unite these factions, but the toxic tendencies of human nature prevailed, and their efforts failed. For decades, humanity lived on the ships, hoping for a chance to return to their home planet.

The slow subsiding of the radiation levels on Earth gave them a glimmer of hope. However, they were not the only beings interested in their planet. Unknown to them, an alien species with far more advanced technology was also waiting for this moment.

Each faction received a sudden signal from their planet, and they raced to Earth to survey and research the areas of the planet. To their dismay, they discovered that their efforts were in vain - their teams were eradicated by the aliens.

The aliens were determined to claim Earth for themselves, and humanity was forced to unite once again. They pooled their resources and knowledge to invent a machine that would allow them to travel back in time, to undo the damage that had been done to their planet. It was a once-forbidden method, but they had no other choice. The survival of their species was at stake.

As they prepared to launch the machine, they were seized by the aliens. In the chaos that ensued, only one survivor remained - a lone human who managed to jump through time. He found himself in a world that was eerily familiar, but vastly different.

The once-dull dark skies were now filled with stars that can be clearly seen in the night sky, the air was fresh and the scenery in front of him was a marvel for him to behold. He realized with a heavy heart that he had traveled back to the time before the war - before humanity's downfall.

He was filled with a sense of urgency, knowing that he had to prepare humanity for the future casualty. But could he do it alone? Would he be able to convince his fellow humans to lay down their weapons and prepare for the future catastrophe? The weight of the task ahead of him was overwhelming, but he knew he had to try. The fate of Earth depended on it.