Set 18 months after movie "Library Wars." After the government's enactment of the Media Betterment Act, battles wage between the Betterment Squads and the Library Defense. The Library Defense resists censorship and advocates freedom of expression. The biggest battle awaits for the Library Defense.
| Actor | Role |
|---|---|
 Junichi OkadaAtsushi Dōjō | Atsushi Dōjō |
 Nana EikuraIku Kasahara | Iku Kasahara |
 Chiaki KuriyamaAsako Shibasaki | Asako Shibasaki |
 Kei TanakaMikihisa Komaki | Mikihisa Komaki |
 Sota FukushiHikaru Tezuka | Hikaru Tezuka |
 Koji IshizakaIwao Nishina | Iwao Nishina |
 Tori MatsuzakaSatoshi Tezuka | Satoshi Tezuka |
 Tao TsuchiyaMarie Nakazawa | Marie Nakazawa |
 Aoi NakamuraShuji Asahina | Shuji Asahina |
 Naomi NishidaMaki Orikuchi | Maki Orikuchi |
 Jun HashimotoRyusuke Kenta | Ryusuke Kenta |
 Ryōta WadaNot listed | Not listed |
 Nozomi FukudaHori | Hori |
| OOsamu NarimatsuNot listed | Not listed |