 It is the 23rd Century, where the survivors of a nuclear war live within a domed city sealed off from the outside world, where all citizens can only live until they are 30 years. Logan, A Sandman, a elite policeman whose job whose job is to terminate all runners who refuse to die at 30 and refuse to be terminated in the Extermination ceremony "Carousel", begins to question the system. Logan and a woman named Jessica leaves the city to go in search of the mysterious place "Sanctuary". Where they stumble upon a mountain city ruled by Draco and Siri and they meet Rem, a android who decides to join them in their search for Sanctuary.