Later half of 21st century, summer. Tokyo after the Great Earthquake. The world where the chosen few are embedded with a microchip named "Sky Implant"(AKA: Si) and are controlled by the system. Hajima Sora had been given the skill set of an "Artist". After graduating from a special training school, lived like a hermit in a Si-based mansion "Cocoon". All jobs were conducted over the internet, daily necessaries were bought on-line and days goes by without having any human contact. One day, an incident occurs that shatters the secluded freedom he so enjoyed...