故事始于山王联合会。以总长眼镜蛇为首,大和、阿檀、阿铁等个性十足的成员集结于山王联合会,几人的脑海中只有一个念头,就是守护这个街区。而在他们几个守护街区和平、努力避免不必要的冲突之人面前,出现了一名男子。而事态则因这名男子发生了巨大的变化,SWORD的平衡将被打破…S.W.O.R.D. Chiku is a devastated and dangerous town with 5 gangs fighting fiercely. Before these 5 gangs, the legendary Mugen gang dominated the town. Mugen and the Amamiya Brothers (who did not submit to Mugen) clashed and Mugen disbanded, but .