The narrative depicts a renowned strong team known as Mugen who ruled over a town. They encountered opposition from the Amamiya Brothers, the only individuals capable of standing up to them due to their strength. Eventually, Mugen disbanded and the Amamiya Brothers vanished without a trace. Following this event, five gangs-Sannou Hoodlum Squad, White Rascals, Oya High School, Rude Boys, and Daruma Ikka-emerged as G-SWORD, claiming dominance over the area with their respective names reflected in the name "SWORD" of the region.