Season 0 of 99.9 Criminal Lawyer premiered on December 29, 2021.

Season 1 of 99.9 Criminal Lawyer premiered on April 17, 2016.

Hiroto Miyama is a poor lawyer who takes on criminal cases, but unable to make money. He pursues the truth for the 0.1% out of Japan's 99.9% conviction rate. One day, Hiroto is scouted by Haruhiko Madarame. Haruhiko Madarame is the head of Madarame Law Firm which is one of the biggest law firms among the 4 big law firms. Hiroto Miyama begins to work with Atsuhiro Sada. Atsuhiro Sada is a lawyer specializing in civil cases and makes lots of money for the law firm. He doesn't have any interest in criminal cases which can not make money.

Season 2 of 99.9 Criminal Lawyer premiered on January 14, 2018.