In 2019, public anger at media excess has led to censorship of television, newspapers, the internet, books, movies, and music under the ‘Media Betterment Act’. To fight the armed ‘Betterment Squads’ that go around destroying objectionable materials, the nation’s libraries have formed their own para-military ‘Library Defense’. Iku Kasahara (Nana Eikura) is a new recruit to the corps, where her instructor and squad leader is Atsushi Dojo (Junichi Okada). At first repelled by his by-the-book approach to leadership, she is gradually won over by his commitment to their battle for ‘books’ and ‘the freedom to know.’
Based on the light novel “Toshokan Senso” by Hiro Arikawa.

時は2019年。国民が触れるメディアを徹底統制する法律「メディア良化法」が制定され、テレビや新聞、ネットや書籍、映画、音楽はすべて国家による検閲が行われる近未来の日本。武力行使さえ許される不当な検閲や図書の焼き捨てから“本”と“知る自由”を守るためメディア良化隊との抗争を続ける、自衛組織「図書隊」で小班長を務める堂上篤（岡田准一）のもとに、新米女性隊員の笠原郁（榮倉奈々）が入隊する。一切の甘えを許さない厳しい指導を行う堂上に笠原は反発するが、信念をもって戦いに身を投じる堂上に対して次第に信頼を覚えるのだった。