The town of Rive is hosting an Expo where the Eternal Engine, an engine that can run forever without an external power supply, will be unveiled. But, the criminal genius, Ventre, is out to claim it for his own.

Ciel and Copain, best friends and well-known Gunners in Rive, have been asked by the chief of police, Hardi, to assist in guarding the Expo. They are soon joined by a female Gunner, Femme, who arrives from a nearby town, Neju. Only these talented Gunners, pilots of specialized aircraft, can foil Ventre's plan in this aerial combat adventure.

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