The Temporal Warden: Dragons and Angels

On a bright spring day in the year 2040, the world simply ended. How can the world simply end? It was not due to a climatic effect but rather a sinister oversight by a global commercial consortium gone awry. However, the history of humanity is not as straightforward as it seems. It was overseen by a benevolent alien coalition from the constellation of Canis Major known as The Council. They had seeded this planet over hundreds of thousands of years.
Whenever an extinction event loomed, they intervened. On another Earth almost identical to this one, eighty percent of the population woke up to their normal lives, unaware of two exceptional differences. Firstly, they were infertile-the concept of fertility had been erased from their DNA memory. Secondly, twenty percent of the population was missing, also due to alterations in their DNA, and they were oblivious to this loss.
Meanwhile, on the original Earth, the remaining twenty percent were relocated after the planet had been cleansed and revitalized. But these individuals were different; they were fourth-dimensional beings capable of traversing stars and time as pure consciousness. With this extraordinary ability, they were entrusted with a mission: to journey back in time before the End Days and guide the greatest species of the past to join them on a new Earth.
The dragons, beings from another star system who had made Earth their home for millennia, were the first to be offered a chance at survival away from extinction. This is the chronicle of travelers from an altered future as they embark on missions to rescue species from the past.