Os 3 tells the story of three university students from different parts of the country who decide to live together and become the best of friends. After graduation, jobless, unable to support themselves, the three decide to transform their apartment, and consequently their day-to-day activities, into a reality show sponsored by a major department store that sees great marketing possibilities in their youthful life style. Everything they use in their apartment is up for sale on the Internet, a mere click away. Little by little, their lives are transformed into a stage full of truths based on lies as well as lies that hold truths within. The fiction world they create becomes confused with reality and not even they know what to believe in any more.