Mr. Miyagi

4 members of a very dangerous gang of the northern Portuguese town of Viana do Castelo decided, after their regular karate practice, to form a band. They had planned long ago their own method of self defense, a mix of karate and ferocious mosh pit tactics that had made them the most feared gang of the area.
But the plan could not be only self defense through miyagi-style karate tricks. No. The offensive side of the gang started when the band stole music equipment from rival gangs and started to make what is now perceived as legendary, counter-attack music.
They cannot be stopped and they will not be stopped. They have refined the martial arts of east-coast Japan, and blended their own northern Portuguese fast core deadly techniques and, thus, created the gang killing machine known as Mr. Miyagi.