In U.C. 0123, a period of peace and prosperity has led Earth Federation to expand further into space with the construction of new colonies. However, this progress is threatened by the emergence of an opposing force known as the Crossbone Vanguard, an aristocratic group determined to seize control over the newly constructed Frontier Side colonies for their own benefit. As a result, ordinary citizens living on the front line find themselves caught in the crossfire between these powerful factions.Amidst this turmoil, Seabook Arno is reluctantly thrown into the role of a warrior as he and a group of close friends and family desperately seek refuge from the escalating conflict. Their salvation arrives in the form of an advanced Gundam, the F91, which they must skillfully navigate to survive and protect their loved ones. As the battlefield closes in around them, Seabook and his comrades face not only the constant threat of danger but also the moral dilemma of using such devastating power to defend their home. This is a gripping tale of courage, sacrifice, and the fight for survival as an unsuspecting group of civilians are thrust into a war they never chose.
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