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Welcome to the future, where the norms are vast bio-constructed cities, air toxic enough to force citizens to wear oxygen masks, and crime so severe that the cops drive tanks! When a mysterious winged girl with the power to cleanse the poisoned air is kidnapped by the villainous Buaku, police mini-tank commander Leona Ozaki, her tank Bonaparte, and her lovesick partner Al must confront the arch-criminal and his catgirl molls-the beautiful and deadly Annapuma and Unipuma-before Buaku's master plan kicks into gear. Buaku has more than money on his mind, and the future fate of humanity hangs in the balance!