Start with the Immortal Game

On the day when the "Immortal Game" came, there were no signs. At first people thought it was just an afterimage on the retina, an hallucination caused by lack of sleep. The translucent countdown that appeared in the upper left corner of the field of vision was accurate to the second, like a polite reminder. Later, the social network exploded, and six billion people around the world saw the same thing at the same moment - a line of cold white numbers, marking everyone's remaining life span. Some people only have three days left, others have ninety-one years and four months left, and some people watch their number jump from "unknown" to "one hundred and thirty-two days" the moment the diagnosis notification is delivered.