The first combat mission for three former cadets of the famous flight school turned out to be completely difficult - during a routine flight they had to face a representative of an alien civilization. They accepted the battle and were saved only by a miracle. And although their home planet did not immediately believe their words, there was enough evidence for everyone to see how unusual and dangerous the enemy was lurking in deep space. Now the countries of the Earth will have to forget about old squabbles, stop senseless conflicts and , for the first time in a very long time, join forces. The survival instinct will force Humanity to begin preparing a fleet of unprecedented strength, which, without a doubt, will go towards the enemy. And together with the fleet, three former cadets will begin training in order to return to where they took their first battle.