For five years, humanity has been living in isolation. The new virus has mutated and become deadly. Sales Corporation is introducing robotic assistants that minimize human contact through courier delivery and autopilots. In a town called “Green Zone”, employees of the corporation live, and there is also a medical laboratory in which a new vaccine is being developed. Programmer Sergei goes to the Green Zone for employment. But as soon as he enters the territory of the town, his mobile loses signal. After a short interview, Sergei is placed in a guest room. He had no idea what secrets would be revealed to him during the night spent in the apartments of the main building, and what the Sales corporation actually does.