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...