At the beginning of the XXII century, the sky of the Earth is covered with darkness, melting confusion and suffering. From distant stars, a dangerous threat in the person of the Esterai Empire approaches Earth. A terrible enemy from the center of the Galaxy plans to use biological weapons never seen before. Earthlings fly away in search of a new home, but migration will not save from interstellar war. Young Roma Nikitin decides to become a member of the resistance to the alien invader and enters the Military Academy to study as a scout. In the life of cadets - guys and girls who have just crossed the threshold of adulthood, there is a place for everything - study, parties, dates, fights, space flights, friendship, enmity, love, betrayal. They will plunge into the world of adventure of youth.