In a world where war has long ceased to be a battle and has become a system of annihilation, humanity has learned to live among the ruins and call it "peace." The Republic of San Magnolia claims to wage a clean war without casualties, but beyond its walls lies a territory where people have long ceased to be considered human. There, soldiers are born - soldiers for whom death is merely a matter of time. And it is here, on the edge of utter oblivion, that something not belonging to this world appears. Titans fall from the sky - war machines from another era, built for battles where survival was considered the norm, not a miracle. Among them is BT-7274, an intelligence too "human" for a machine, and his pilot, Jack Cooper - a soldier who was never meant to become a legend. Their arrival shatters the established order of war. When fate brings them together with the Spearhead squadron, led by Shinei Nouzen - a pilot who sees death before it arrives - a new chapter of the conflict begins. Two worlds, two types of war, two systems that were never meant to intersect are now forced to fight side by side. But the enemy does not change. The Legion continues its advance, knowing no fatigue. People keep dying, unaware of the names of those who command them. And amidst this chaos, a new form of resistance is born - not an army, not a state, but a Vanguard. Those who go first into battle, knowing there may be no one behind them. Cooper and BT become the breaking point. Shin and Spearhead - the last shield. Together, they become a force that challenges the very idea of war as an inevitability. But the deeper they venture into this conflict, the clearer the truth becomes: the enemy is not only on the outside. It is embedded into the very system of a world where human life has long lost its value. And now the question is different: If war never ends... who will be humanity's last Vanguard?