Tlatelolco, Verano del 68
Starring Cassandra Ciangherotti, Teresa Ruiz, Alejandra Ambrosi, Lucía Blaksley, Roberto Sosa, Ricardo Kleinbaum, Juan Manuel Bernal, Juan Carlos Colombo, Claudette Maillé, Christian Vázquez
It's a drama and romance movie, and has a rating of 6.3 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Brazil.