Our past is always shrouded in mystery, just like the past of our planet. Are we worthy of our Earth? Are they worthy of single-handedly enjoying all its beauties and riches? And do we have a priority right to this over other intelligent beings from various galactic systems of the vast Galaxy? What grounds do we have for this? Biochemist Saav, a representative of the anthropomorphic amphibian civilization Talan, from the dying planet Tauraan, finds a vaccine formula that will help the Talans live on Earth - the only suitable option at the moment for their relocation. The solar system on the star maps of the intergalactic union of intelligent communities is marked as no-man's territory. The Talans need to quickly stake out this planet for themselves, since in this system they saw powerful Hephaestians, merciless destroyers of planets. But what should we do with the people, the current inhabitants of the Earth? Leave them here and live with them? Or maybe just destroy them? Or transfer them all to Tauran? The story of friendship and love of five young friends, representatives of different planets, who, by the will of fate, found themselves in a cruel period of struggle between different civilizations for planet Earth.