2010. The earth is completely polluted and inhabitants have to wear gas masks. Annapuna and Unipuma, with the half-human, half-cyborg Buaku, attack society. Only the 'Tank Police' can defend the rights of the ordinary citizen. This gang committed against the evil cat sisters has a new recruit, Leona Ozaki and they are seeking an old portrait of Buaku to find out if there was ever anything good about this hideous monstrosity.