
The "99.9" refers to the 99.9% conviction rate in Japanese criminal cases, and the lawyer who solves the remaining 0.1% of acquittals is the protagonist of this film.

The super unconventional lawyer is back! Our new friends are comic book girls! And the biggest enemy of all! The strongest lawyer who manipulates the prosecution behind the scenes sets out to prove the devil... Take on a case that is 100% impossible to prove!

Hiroto Miyama works with rookie lawyer Honoka Kono on a team specializing in criminal cases for Madarame Law Firm. Atsuhiro Sada has recently become director. One day, the firm receives a request about a case that took place 15 years ago—concerning a poisonous wine incident.