The quasi-fictional story of transgender sex workers living in Rio de Janeiro's swampy red light district, who are joined by a group of hippies and a runaway stockbroker, "Mangue-Bangue" is the paradigmatic expression of the post-1968 spirit of desbunde, the Brazilian slang catchword for "sex, drugs, and rock 'n' roll".

In an overcrowded prision cell, each man has to make his own way and secure himself from the constant threat of sexual violence coming from the rest of the inmates.