The case of the "evil woman of the century" Takakazu Ando (played by Yuki Koyuki) poisoning her lover shocked the whole country, thus opening the prelude to "Legal High 2". Still unchanging in nature, Kensuke Kumemon (played by Masato Sakai) braved the world's disapproval and became Takakazu's lawyer to defend his innocence. However, he was blocked by the rookie prosecutor Haruki Hanyu (played by Masaki Okada) who had been an intern under him, and he suffered an unprecedented defeat for the first time. After that, Hanyu, who dreamed of bringing happiness to everyone, resigned from his public office and opened a law firm. While Kumemon Kazuma Machiko (played by Yui Aragaki) was committed to lobbying Takakazu to appeal, she had to take on various strange and difficult small cases in order to make up for the expenses of the firm. In this process, Hanyu was both an enemy and a friend, and became Kumemon's another tough opponent after lawyer Miki (played by Katsuhisa Namase). One is a "bad lawyer" who regards the court as a battlefield and values victory and money more than justice, and the other is Mr. Win-Win, who has a smile as warm as the sun and is eager to resolve all disputes. The good drama of verbal battle is staged again...