Shogo Kai/
Yuji Oda is a lawyer at one of the big 4 law firms in Japan. He is good at his job, but he is arrogant. Kai only thinks about winning and he thinks the only way to satisfy his clients is to win. He is getting close to becoming a senior partner at the law firm. Kai's boss worries about his focus on winning above all else. As a condition of his promotion at the law firm, his boss asks him to hire a young lawyer as an associate. Kai interviews prospective young lawyers and meets Daiki Suzuki/
Yuto Nakajima. Suzuki has high intelligence and his memory ability is amazing.
When Suzuki was a child, he lost his parents in an accident. He was raised by his grandmother in Shizuoka. Because of financial difficulties, he works part-time jobs. Suzuki was eligible to take the bar exam at one point, but he got caught taking university entrance exams for other people. He was then expelled from high school and banned from taking the bar exam. After moving to Tokyo, Suzuki takes part in petty crimes to make money, like taking exams for other people. He needs to make big money though because of his sick grandmother. He faces the biggest crisis in his life and then meets Shogo Kai.