Lena finds herself growing closer to the Spearhead squadron, or so she thinks. But a deadly battle drastically changes her perspective.

The crew of Spearhead has left on their final mission, never to return home. What awaits them outside the borders of their home?

The team prepares for a final suicide mission against "Morpho," a massive railgun Legion capable of single-handedly turning the tide of the battle.

The operation to destroy the Morpho was a success, and Shin and his team fulfilled their promise to return to the Federacy alive. After enjoying a brief respite, they once again wished to serve in frontline units, but they received a certain notice from Ernst. After crossing the deadly battlefields of the Republic, they arrived at a new meeting in the Federacy. They fight, suffer, and see a ray of hope. This is a story of boys and girls who have begun to move little by little. At the end of their journey, what is reflected in their eyes?