In the year 2274, the remains of human civilization live in a sealed, domed city. After a global catastrophe, this society was designed as a "perfect" utopia where every physical need is catered to, work is nonexistent, and hedonism is encouraged.
: On their 30th birthday, citizens participate in a quasi-religious ritual called Carousel, where they are told they will be "renewed" (reincarnated). In reality, it is a public execution.
: Every citizen has a crystal implanted in their palm at birth that changes color as they age. When it begins blinking red, their "Lastday" has arrived.