Carnage Online
With the bestowment of "God's awakening" a virtual reality game and ample information on what was to come, Earth was given all the resources it needed to succeed in its ascension, but in the end, to the shock of all they horribly failed.
Earth's failure was so bad that they lost their status as sentient beings and were demoted to the status of primal animals.
Years later, the prideful human race is facing extinction and the few who still live have become the best of slaves anyone could have.
Cash is a man unfortunate to have been born in this era of humanity's rise and downfall, but while the rest of his race wallow in their sufferings and beg for death, Cash desires for something.
"Desires are meant for only the strong."
This was a lesson Cash had been taught and had taken to heart, but now the only problem for people like him is that their strength lay in the past, having been missed.
Returning to the past seems like an unbelievable feat, but when you can have a world Lord die for you, it becomes a piece of cake.