Set during the Meiji Restoration period of Edo era Japan, Naoyuki belongs to the 8th generation of the Inoyama family, a wealthy family known for finance & accounting. He is also a gifted mathematician and uses the abacus with extreme skills. Naoyuki works under the declining Kaga domain. Because of this, Naoyuki and his wife Koma suffer hardships as their stature and wealth dissipates.

A son quits his job and is persuaded by his father to head off to a cottage in the remote mountains. Together, the two of them manage to get through their days while wearing old jerseys left by a deceased grandmother. The following summer, the two once again leave the stifling heat of Tokyo, as if escaping to the mountain cottage. However, the next summer is very different.

Mikio is a married man and works hard for the company where he is employed. Then one day Mikio is diagnosed with depression. Mikio's wife is Haruko. They have been married for 5 years. Haruko draws comics for work, but they do not sell well. She mainly relied on Mikio for support. Meanwhile, Haruko did not notice any changes in her husband. She begins to blame herself for not noticing any signs. Mikio's depression derived from his work. His company has been pressing him to quit the company. After Mikio quits his job his condition improves, but the dynamics of their relationship changes.

Set in an alternate universe, the ancient capital of Kamakura is a vibrant town where fantastical creatures live alongside humans. Akiko is a cheerful publishing assistant who moves into town after marrying Masakazu, a popular mystery writer. Akiko is surprised by the unusual town but enjoys the new curiosities surrounding her. However, just as she was beginning to settle in, a trifling incident sweeps her spirit to the underworld too soon. Convinced that destiny has something else in store for his wife, Masakazu journeys into the underworld to bring back Akiko’s spirit.

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.

Komikado-sensei is back!! And together with him, Mayuzumi and Hattori. This season, a new employee joins their team. Hanyu Haruki comes from a rich family. His father owns a highly profitable trading company, while his mother is a children's books writer. Hanyu has lived in England, Saudi Arabia and USA, before returning to Japan to sit for his bar exam. After finishing his apprenticeship, he joins the Public Prosecutor department. To broaden his experience, Hanyu is loaned out to Komikado's law firm.