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 99.9-刑事専門弁護士 collection gathers 2 films released across 2021. Below is every entry in release order, each linking through to its cast, crew and full details in LDB — the Loaded Database.