Gran and his crew must prevent a vengeful archduke from unleashing a slumbering giant. Driven by a desire for revenge, Tzaka the Great, once a kind-hearted man, now seeks to use Lyria's power to activate the Colossus. Gran and his team face the challenge of stopping the archduke and the colossal automaton, especially when the Black Knight and her allies enter the fray, all within the confines of an old factory.

This volume of the Granblue Fantasy manga adapts the narrative from the popular RPG, drawing on the design pedigree of Final Fantasy veterans. The story focuses on Gran and his crew's efforts to thwart Tzaka the Great's revenge plot, which involves activating the powerful Colossus using Lyria's abilities. The introduction of the Black Knight and her allies escalates the conflict, creating a race against time to resolve the situation. The premise suggests a blend of action, fantasy, and character-driven conflict as the crew navigates the dangerous factory setting.