Lupin and company pull off a string of bank robberies in one evening, but Lupin's objective is to buy the only Great Golden Swallowtail Butterfly in captivity at auction. This butterfly has the ability to detect gold veins. Maniak, winner of the auction, leads an armed troop who destroy the environment in their search for gold. Their acts of trampling the butterfly paradise under their feet is unbearable. Will nature be avenged against such brutality? The butterflies' eyes light up.