Year 2435 of the Earth era. Two young scientists, Mathias Nagozy and Suzanne Fergusson, are sent on a mission to the planet Primus, recently discovered to be the only one in the galaxy to be Earth's twin and habitable for humans without the need for terraforming technology.

Instead, it presents an untouched aspect of nature and places that Earth has lost for centuries, now polluted and corrupted. Their interest, besides the similarity to Earth, is driven by the possibility that among its resources lies Timesium, precious for space travel.

Furthermore, it's the first place where an alien civilization has revealed itself to humans, in the form of a mysterious figure who appears to the inhabitants of the first base on Primo every year and then disappears. The young scientists must help unravel the mystery, but they realize that commercial interests are enormous and will have no regard for the fate of the planet Primus.

Dark plots and cruel characters emerge on the scene, and soon the two young scientists will be involved in a struggle that will determine the future of the Universe, but will also lead to revealing the distant origins from which they themselves derive and will forever upheave their existence. .