Mika, lives on Earth. It is the year 2223. It is a world of overpopulation, fatal dust storms, famine, and desolation.
When a group of scientists kidnap groups of people who won't be missed, taking Mika along with them, they are all given a choice.
Extermination or salvation.
They would be a literal experiment on a prehistoric planet that has no civilization whatsoever. From then on their life would be filled with predators, floods, and stone age resources. But also filled with lush terrain, clean water, fresh air, and a clean slate.