In the year 2074, aliens from Mercury invade Earth. Their Democracy is based off of a dictator, but things get worse quickly. The Earth is warming up, and the population is rising dramatically. As a result, the aliens, known only as the Travelers, make a solution that would solve the problems, but cause bigger ones. Once reaching the age of 10, all kids are required to take a test that chooses their fate. You pass, you live. You fail, you die. Students around the world take this test every 5 years. But not everyone is happy with this. Rebels form rebellions and believe the Travelers should go back to Mercury and leave Earth in peace.