Enemy Space Fleet continuously attacks the capital planet Prime - the last hotbed of resistance in the Systems Union. The defenders have no chance of surviving, but they stand to death, not knowing that the solution to the mystery is close. The smuggler who became the last hope of civilization seems to have found a way to save the world. But will the price of salvation be excessively high? His grand find can both save the world and destroy it completely. Prime's scouts, who studied the underbelly of the dark world, revealed all the secrets of the invasion army. But they have gone too far into the dark zone and are not destined to return with valuable information. The last attack of the defenders of Prime threatens to develop into mutual extermination. Armada warships converge in decisive battles, the heroes sacrifice themselves to save the world and loved ones. Who will win the final battle is unknown. Only one thing is clear: Prime is destined to fall.