In a distant future, humanity has expanded its territory across space, but tensions between different factions are rising. The story follows Seabook Arno, a young man living in a small space colony who is passionate about technology and mechanics. Everything changes when his peaceful life is disrupted by an attack from the nefarious Crossbone Vanguard, a rebel group intent on conquering space. During this attack, Seabook faces the harsh reality of war and is drawn into the conflict.
Alongside his friend and mech pilot, Cecily Faira, Seabook discovers an advanced Mobile Suit called F91, which becomes his only hope amid the chaos. With the help of a group of resilient warriors, Seabook must learn to pilot this powerful combat suit and confront the enemies that threaten not only his life but also the future of humanity.
As he explores the dark side of war, Seabook finds himself at a moral crossroads, forced to question his ideals and face the harsh reality of the sacrifices involved in combat. The film combines thrilling action with profound ethical dilemmas and stunning animation, taking viewers on an exciting journey through space, where courage and hope struggle to prevail amid despair. The battle for a better future has begun, and only the brave will triumph.