Luka, a young and ambitious soldier, embeds himself in the legendary Fort Kairos where heroic warriors defend the remains of civilization. His hopes to serve as an elite sniper are crushed when he is assigned to maintenance and must submit to the code of Kairos: obedience-endurance-sacrifice. As he rises through the ranks, Luka finds joy and strength in friendships with Konstantin, an enigmatic radar engineer, and Geronimo, a light-hearted private.