Iku Kasahara is the main character of the series. She is twenty-two-years-old and is initially ranked Librarian First Class, but is later promoted to Chief Librarian. She joined the Library Defense Force's Kantō Library Base in 2019 after being inspired by a high ranking Kantō Library Defense Force member who saved a book she wanted to buy that was targeted for censorship. She holds this unknown person in high regard, thinking of him as her "prince", and she wants to be an "ally of justice" as he was for her. As such, she has a strong sense of justice when it comes to freedom of expression and is willing to put her life on the line for the books she has sworn to protect. When she enters into recruit training, however, she finds it to be very challenging, made especially so by her drill instructor Atsushi Dojo who pushes her harder than most other recruits. In high school, she had been a member of the track and field team, so she has a lot of stamina and drive to continue with the Library Defense Force.  When the story begins, Kasahara is a sub-par recruit who constantly makes fatal mistakes and is not as knowledgeable about the cause she is in the middle of compared to others around her, mostly due to her not paying attention in lectures on the base. Despite these apparent flaws, she is recruited into the base's Library Task Force, an elite group of soldiers who go through rigorous training in order to respond during difficult operations. While at first she starts out slow, she soon becomes capable of clerical tasks in regard to working in the base's library, though still finds it difficult to make a strong presence on Dojo, her superior officer.   After quite some time of working under Dojo and receiving great care from him (which she didn't expect), her feelings began to soften and she began opening up to Dojo.   ~!Later on thanks to Satoshi Tezuka, Kasahara found out that Dojo is actually her prince. At first, she was so confused and got extremely awkward around him, but thanks to Komaki, she realized that she had to accept her prince for who he really is. She also admitted to herself that even if Dojo is not her prince, she might've fallen in love with him.!~   ~!At the end of the movie, it is implied she and Dojo got married.!~

Toshokan Sensou tells the story of Kasahara Iku, the first woman to join the Library Task Force. In the near future in Japan, the Media Enhancement Law has been forced upon the population censoring all books and media. To counter this, the Library Defense Force was created. To protect themselves against the Media Enhancement Law Commission, all major libraries are fully equipped with a military Task Force, who take it upon themselves to protect the books and freedom of media of the people. This anime follows Iku and her fellow soldiers as they protect various special books and artifacts from the oppression of the Media Enhancement Law Commission. A love story, war story, and comedy all rolled into one.

__Agency:__ Aoni Production

[Profile](https://www.aoni.co.jp/search/inoue-marina.html) | [Blog](http://yaplog.jp/marinavi/) | [Twitter](https://twitter.com/Mari_navi) | [Anison](http://anison.info/data/person/17179.html) | [Wiki (en)](https://en.wikipedia.org/wiki/Marina_Inoue) | [Wiki (jp)](https://ja.wikipedia.org/wiki/%E4%BA%95%E4%B8%8A%E9%BA%BB%E9%87%8C%E5%A5%88)

A voice actress and singer. She is signed onto Sony Music Japan's Aniplex division as a music artist. Formerly under the agency Sigma Seven, she transferred to Aoni Pro in 2022.

**Non-Anime Roles:**
- Pallas - Arknights (VG)
- Elysia - Honkai Impact 3rd (VG)
- Yanqing - Honkai: Star Rail (VG)
- Helm - Goddess of Victory: Nikke (VG)

Iku Kasahara has dreamed of joining the Library Forces ever since one of its soldiers stepped in to protect her favorite book from being confiscated in a bookstore when she was younger. But now that she’s finally a recruit, she’s finding her dream job to be a bit of a nightmare. Especially since her hard-hearted drill instructor seems to have it in for her!
 
(Source: Viz Media)

Kasahara Iku and Dojo Atsushi receive an emergency recall in the middle of their date as Japan is rocked by a terror attack. Their new duty is a protection detail assigned to Touma Kurato, an author. Meanwhile, the relationship between Librarians and the Media Purity Committee is also worsening. 

An unaired episode included in the Toshokan Sensou DVD volume 3, and later on Blu-ray Box (June 8, 2012) that celebrates the airing of Toshokan Sensou: Kakumei no Tsubasa. 
Komaki was arrested for the violation of human rights of his girl friend Marie, who had difficulty in hearing. He was kept in custody and tortured by the Media Improvement Forces. The members of the Task Forces made a desperate effort to rescue him.