由于涉嫌用枪支威胁“守法好市民”，当初以史上最差成绩从警校毕业的小巡警菊川玲二（生田斗真 饰）正式被署长酒见路夫（吹越满 饰）宣布开除公职。当他怒不可遏之际，却得知自己已被选为卧底，潜入关东头号黑帮数寄矢会，搜集会长轰周宝（岩城滉一 饰）操纵制造与贩卖毒品的证据。在经受了魔鬼教练一美先生（远藤宪一 饰）的折磨蹂躏后，玲二从头到尾焕然一新，走进了数寄矢会所控制的俱乐部，在此用鲜血结识了一生的兄弟——有着疯蝴蝶之称的阿湖义组的若头日浦匡也（堤真一 饰）。当他总算迈入黑道大门时，来自关西的蜂乃巢会则图谋挑起一场东西黑道大战争。站在风口浪尖的玲二，此时早已没有抽身的机会……
本片根据高桥升的同名漫画改编。
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