看起来吊儿郎当的龙崎郁夫(生田斗真 饰)是新宿第二警署破案率最高的王牌刑警,这一天令系出名门的搭档日比野美月(上野树里 饰)大为光火。与此同时,盘踞在新宿的松江组若头段野龙哉(小栗旬 饰)以生意人身份从事各种违法犯罪勾当,他总能在适当的时刻得到情报,逃脱警方一次次的搜捕。看起来分明行走在黑白两条道路上而没有任何交集的两人,竟然有着难以割舍的渊源。郁夫和小龙在少年时均在孤儿院长大,他们曾度过快乐无忧的童年,但是最最敬爱的结子老师(广末凉子 饰)遇害给两人以沉痛打击。他们发誓一定要找出真正的凶手报仇,这对好兄弟以警察和黑道的身份,分头朝着最终的目标前进。 绵亘多年的复仇之战,无间双龙蓄势待发……Ikuo and Tatsuya are orphans. They live at Mahoroba's house which is a child and family services home. At their elementary school, they see Teacher Yuko, who took good care of them like a real older sister, killed right in front of them. Ikuo and Tatsuya tell the police what they saw, but the case is covered by a police officer wearing a gold watch. 15 years later, Ikuo (Toma Ikuta) now works as a detective. He is a good person and his arrest rate is the highest at the police station. Meanwhile, using his handsome appearance and cleverness, Tatsuya (Shun Oguri) becomes a high ranking yakuza. Detective Ikuo and Yakuza Tatsuya have a singular purpose, which is to find the man wearing the gold watch, dig out the truth and reveal the dark side of the police organization.
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