In the near/far future, Earth is invaded by a race of Aliens who travel the galaxy searching for habitable planets and exterminates its native species so it can have the planet to itself. Thousands of races far more advanced than humans have fallen before this invading species. When it reaches Earth, humanity is far from prepared. However they are able to repel the invaders for 13 years before the invaders ultimately destroy Earth. Humanity is broken at the loss of their homeworld, but is visited by another race of aliens who are more of historians than warriors. The aliens tell the humans about the nature and past of the invaders and how humanity was the only race to ever survive an attack from them let alone repel them for thirteen years. Afterwards, what humans there are left decided to go and protect the next race and their homeworld from the same fate they had suffered even against the wishes of the historian race.