Planet Kadres is ready to present to the coalition of the Three star systems its newest creation - the technology of the Yarvi planetary shield, which, if necessary, should protect the world from outside threats. Scientists have successfully completed all preparatory tests and checks, and Yarvi is ready for its first launch. Its date coincides with an important holiday - Coalition Founding Day. However, in the midst of these events, the three systems are attacked by an unknown and very powerful enemy. He quickly overruns the Coalition's most populous worlds, which for some unknown reason surrender without a fight. Enemy ships are moving towards Kadres, and for now the only hope left for a free planet is on Yarvi.