At 27, Ryoma Shiba is a lawyer who is a central member of the corporate legal team at a major law firm. He is a man who doesn't show any weakness, but at an auction, he meets a young man with clear eyes named Haruto. By chance, he lets Haruto live with him and hires him as an investigator to work on his cases. However, Haruto's "poison" gradually seeps into the cold and resolute heart of Shiba...!? An unusual legal suspense story presented by an elite lawyer and a genius con artist!