Jaku, September, Kaito and Ray live in a special, artificial world. For 200 years, the universe has gone..different, and the citizens of every planet are forced to flee into the fake, artificial world, SAN-3f. For centuries, the rulers of SAN-f3 let the people believe only that they exist and they are the only ones remaining..but there is really a whole world out there. Guess the main protagonists that break out of the world and explore?. ;)