Ginbayashi Yoko is a top-class chef at a high-end Italian restaurant, but her life is turned upside down when the owner runs away with all the earnings, forcing the restaurant to close. With two children to support, she takes a job at a local men’s prison as a nutritionist, where her main duties involve planning monthly menus. Encouraged by the warden, she resolves to pursue rehabilitation through food, questioning whether people can truly change and what she herself can achieve. Thus begins her new challenge—aiming for “three-star prison cuisine.”

The murder of a young girl shocks a small Japanese village, and the victim's mother is distraught when the classmates her daughter was playing with all claim not to remember the identity of the killer. In her anger, she puts a curse on them.

Of all the law related dramas inside and outside of the country, a majority of lawyers are depicted as heroes, either bringing tears to your eyes helping the weak underdog, or trying to advocate justice to the extreme. This has led the general public to view lawyers with eyes of respect and envy.

However, the main character of "Legal High!!" stands miles away from that stereotypical identity of a lawyer. Komikado Kensuke is stubborn, abusive in his language, sarcastic, moody, and an extravagant spender. To the contrary, he has never lost a case in his life. A genius at bargaining and building strategy, winning is everything to Kensuke. His love for money, fame, and women obviously collects the dislikes of other professionals in the field. Kensuke loathes the textbook of justice the young lawyers try to brandish.

Unexpectedly, Mayuzumi Machiko is a lawyer who passed her bar exam through hard studies. She is overly earnest in her mission of saving the weak, and rather clumsy and incapable of planning ahead. Her lack of versatility and strong righteousness drives her reckless, without compromise to her convictions. Passionate and determined, she is the complete opposite of Kensuke's character.

"Justice is the winner," Kensuke stands by this belief without doubt. Despite the skepticism he receives for his sensational efforts, the people surrounding him begin to see that their view was but a pipe dream. In the courtroom, Kensuke reminds us of the feeling we had all forgotten: To fight with all our energy and to never give up.