20世纪80年代,就读于东京立川南三中学的阿高(松田翔太 饰)和八仔(福士诚治 饰)是从小一起长大的好朋友,不过他们却走上不同的青春之路。阿高专心学习,礼貌谦恭;八仔则横冲直撞,成为一个地地道道的不良少年。昔日的朋友成为敌人,八仔经常找阿高的麻烦,忍无可忍的阿高头锤还击,结果在暴力中体会到前所未有的快乐。从此,乖乖男摇身一变成为暴力恶童,他和八仔、小佐野(城田优 饰)、小英(古畑胜隆 饰)、小克(途中慎吾 饰)等好哥们儿组成了立川南三锦组,声名远播。在周围数所不良中学的包围下,锦组开始了他们的青春制霸战争…… 本片根据ゲッツ板谷的同名自传体小说改编。Ko-chan used to be an ordinary student, but a fight with another student changed all of that. He fights now, is in brawls, finds trouble and makes trouble and is a de facto gang member. He stands up for his friends and they stand by his side. He also has a crush on Yamada, one of the pretty girls in class.