Kazuhiko Kogure, who is a 2nd grade student in middle school, falls off from one of the school's rooftop. There were other male students on the roof when Kazuhiko Kogure fell off. According to the other students there, Kazuhiko Kogure tried to jump to another school building, but missed. Fortunately, Kazuhiko Kogure only fractured his leg and ribs. According to Kazuhiko Kogure's mother Hidemi, the school insists it was students playing around and did not involve bullying. Hidemi though, doesn't believe it, because Kazuhiko Kogure has a fear of heights. Hidemi goes to see attorney Machiko Mayuzumi and Machiko decides to take her case, but she asks for fellow attorney Kensuke Komikado's help. Meanwhile, the school hires attorney Teshigahara Isao.

Attorneys Kensuke Komikado and Machiko Mayuzumi receive a request from a general hospital. They go up against veteran attorney Kazuma Kujou who is trying to extract money from the general hospital by a medical malpractice lawsuit.

“世纪恶女”安藤贵和（小雪 饰）毒杀情夫一案震惊全国，从而也揭开《Legal High 2》的序幕。依然不改本性的古美门研介（堺雅人 饰）冒天下之大不韪出任贵和的律师，为其进行无罪辩护，谁知却遭到曾在其门下实习的新人检察官羽生晴树（冈田将生 饰）的阻截，更史无前例首尝败绩。在此之后，梦想为所有人带去幸福的羽生辞去公职，转而开起律师事务所。而古美门和黛真知子（新垣结衣 饰）致力于游说贵和上诉的同时，为了弥补事务所的开支而不得不接手各类奇怪棘手的小案子。在这一过程中，羽生亦敌亦友，成为了古美门继三木律师（生濑胜久 饰）之后另一个难缠的对手。
一个是视法庭如战场、将胜利和金钱看作比正义还重的“恶德讼棍”，一个是拥有阳光般温暖笑容渴望圆满解决所有争端的Mr Win-Win。唇枪舌战的好戏再度上演……

三木律师事务所的菜鸟黛真知子（新垣结衣 饰）为了帮一起谋杀案的当事人洗刷清白，在社长秘书泽地（小池荣子 饰）的指点下，找到了传奇律师古美门研介（堺雅人 饰）。古美门拥有极高的辩护才能，为了赢得胜利不惜使用任何手段，他至今保持着骄人的全胜纪录，也曾经是三木（生濑胜久 饰） 麾下的得意门生。但是5年前的一起事件导致这两大律师界巨擘的决裂。看在巨额律师费的份上，古美门同意出山，他凭借巧舌如簧、颠倒黑白的能力赢得诉讼。在此之后，黛加入古美门的事务所继续作为律师的修行，而接下来一连串的官司又将古美门和三木沉疴已久的旧怨重新摆上桌面。
这也是一场法律和正义的较量……