SIN takes place in a post apocalyptic future derived from a universe very similar to ours. In an effort to monitor and control the planet's remaining resources the world's powers came together after a decade of war. Now, under the rule of the U.E.F. (United Earth's Federation) humanity has turned it's survival to space. However not all are privileged enough to make this journey, only those deemed worthy of the new order under "the Queen".
A world now loosely governed, overrun by gangs, private military groups, terrorists, and death; all of Earth seems to provide no more than a fruitless future. Regardless, there are still those of us that fight, we fight the system, we fight each other, we fight for our loved ones... whatever the reason, we do battle.