Dusty Fable

Eleven years ago, the world was bombed beyond anything imaginable
August 18th, 2056, Rotara went back in time and changed the course of the world, ending it for the sake of one person's life.
The surviving humans, around four million, took refuge in a community of giant domed cities along the continent of Antarctica, which was called Komea. Komea filtered the air from outside and heated the inside of the domes, not a single exit in sight.
The king of Komea began to grow old, no heir to take on his reign, so a cruel game was put in place.
Seven people of different ages and genders began a game, destined to kill each other in the end of this cruel game. The last surviving became king or queen of Komea.
Growing attached to certain people, they decide to leave Komea, getting it in their mind they can rebuild the world. It seems that the world was full of way more than radiation, but full of things they couldn't even imagine.
They were chosen for a reason, and they need to escape a terrible fate just so they could survive.