In the year 2036, the "2036 Problem" occurs, where an incident involving computers leads to the destruction of major cities around the world. A similar event is expected to take place in 2038, so a supercomputer called Gaia is used to create an alternate Earth using an Earth Simulator in order to study the possible effects of the impending catastrophe. The experiment was initially inconclusive because of the possibility of low birth rates in the alternate Earth, so a message called the Arecibo Message was used to allow humans to live there. However, humanity in the alternate Earth then create their own Earth Simulator leads to questions about the original Earth's existence. The game takes place in 2037. The protagonist, a hacker named Pollon Takaoka, has an ability which allows him to save and load moments, much like save features in video games.