Toshokan Sensou

In 1989, the Japanese government passed the Media Betterment Act to protect the youth from being influenced by negative materials in the media. To counter this, local governments throughout the country establish "Library Defense Forces" to prevent the Media Betterment Act agents from infringing on people's right to access media deemed as banned material. One of the civilians, Iku Kasahara, had been accosted by an MBA agent after finding out that she had a banned book in her possession in a local bookstore. After being saved by an LDF agent, Kasahara decides to join in the Library Defense Force.

Kasahara gets into a rivalry with a fellow LDF soldier named Hikaru Tezuka, who happens to be the best among the new recruits. His excellence drives Kasahara's confidence to a low even though she gets help from Asako to improve her librarian skills. Kasahara and Tezuka amend their ties and become friends after Media Betterment Act special forces operatives launch a raid on the Kant? library to locate some banned books before the two were able to secure the books and drive away the MBA commandos.

When a museum dedicated to media information gets closed after the death of its curator and owner in Odawara, Kanagawa, MBA special forces commandos launch another operation to seize the museum and collect banned material from inside. However, Kant? LDF units mobilize to protect the facility and hold off the MBA forces from entering the museum. Kasahara is assigned to escort Kazuichi Inamine, a known backer of the Freedom of the Libraries Law and the commanding officer of various LDF units, to a memorial ceremony instead of participating in the operation when she and Inamine's party are accosted by unknown men.

Kasahara and Inamine are taken hostage by a pro-MBA faction known as the Bakushukai, resulting in a hostage rescue operation planned by Ryusuke and Dojo to rescue them after Kasahara leaks their location via a hidden message and the removal of Inamine's prosthetic leg. Kasahara reveals to Dojo that she will not quit from the LDF and plans to be way better than him. However, things do not look too good for Kasahara when she is given a letter from her parents who plan to visit her at the base.

Kasahara tries to keep her real job as a Defense member a secret from her parents so that she is not forced to quit and return home. She tries to enlist the aid of her friends and superiors to help facilitate her parents' tour of the Kanto Library Base, but the true danger of this job is revealed when Kasahara accidentally catches a thief in the library. Her mother is worried sick and is trying to dissuade her from continuing but her father takes her side and says they should respect Kasahara's decision.

Kasahara, along with Lt. Komaki, are on a mission to transport a rare, valuable book back known as the "Book of Prophecy" (a reference to Fahrenheit 451) to the base, when they are attacked by the Media Betterment Act troops. One of the troopers fires at Komaki, injuring him, which causes Kasahara to reprimand the shooter telling him, he had no right to shoot in a neutral territory and that she would punch him for violating the agreement. Komaki escapes with Kasahara despite his injury and takes temporary refuge in a stationary train. They are eventually caught, during which time, Komaki mentions how Dojo as a trainee, punched a MBA trooper who fired a shot at a child, leading to a fist fight between the two factions. At this point, Komaki and Kasahara are rescued by Dojo and his troops. Komaki mentions to Kasahara, that despite everything, Dojo learns from his mistakes, and that is something Kasahara must consider learning from Dojo. Kasahara comes back to the dormitory and sees the twenty missed messages on her cell from a very worried Shibasaki.

Shibasaki begins having meeting with a man name Hikaru Asahina regarding the Library Force and the library where Shibasaki is employed. Kasahara becomes interested in this, and believes Shibasaki to be involved in a relationship. Kasahara becomes angry at Sunagawa from the Library Future Planning Committee after he posts a strongly-opinionated review on one of her favorite books. Tezuka's older brother is the leader of the Library Future Planning Committee, and when Tezuka meets with him, his older brother tries to get him to join the Committee, but Tezuka refuses. Asahina tells Shibasaki over dinner that he can silence some reports of the library where she works of unjustly disposing of certain books, but after getting advice from Kasahara, decides to do nothing. The report is leaked to the media, and it starts a frenzy, and Sunagawa accuses Kasahara of being his accomplice in the disposing of the books.

Kasahara gets interrogated by officials of the LDF's Administration Faction due to Sunagawa's claims. Hikaru thinks that his brother, Satoshi, is influencing the Administrative Faction officials to put pressure on Kasahara and the entire LDF in order for Hikaru to defect to his Library Planning Committee. When Satoshi invites Kasahara for dinner and tells her that the LDF must surrender and disband, she tells him that she would not support his idea, even though he tells her that he would use her as a tool to pressure Hikaru even more. In the end, Dojo comes to see Kasahara despite getting wet in the rain. Due to Dojo's presence and his actions, Satoshi decides to end his interference with the Administration Faction's plans to grill Kasahara further.

Kasahara, Shibasaki, and Tezuka participate in the required promotion tests for librarians. During her time spent on studying, Kasahara panics when she thinks about how the one who saved her during her time as a high school student was Dojo himself. This revelation cripples her concentration to study until Dojo assists her by helping her prepare for the test. In the end, she passes the exams with Shibasaki and Tezuka as well. Kasahara gives Dojo some Chamomile essence oil as a means of showing her gratitude before Dojo asks her to take her to the shop where she obtained the oil so as to try some Chamomile tea.

The library task force is sent out to train a peace loving library in Ibaraki Prefecture where there will be a prefectural art exhibition. There, being the first woman in the task force, Kasahara is constantly bullied by others during the mission. They even go as far as calling up Kasahara's mother and informing her of Kasahara's activities. Kasahara and her mother eventually reach an understanding and it is revealed that the reason why Kasahara's mother is so protective is because of an accident when Kasahara fell as a child and hit her head. Kasahara strikes back at the members of the Affairs Department and inspires Defense members to stand up to them as well.

Tezuka gets information from his brother that the Media Betterment Act agents will only fight at the art exhibition for a single day, which helps the Library Corps prepare for the assault. Three hours before the exhibition opens, MBA task force units comes crashing in and the defense force holds them back even after the MBA agents try to storm the barricade with full force. Their aggression forces LDF soldiers and officers to kill them as they would be killed. Shortly after MBA personnel retreat after Kasahara angrily fires at them, a single agent shoots Genda as he stands in front of the piece of art work the Library Corps was defending before unarmed LDF soldiers apprehend the renegade MBA agent. At the same time, the head of the Ibaraki library Commander Sugawara tries to destroy some implicating evidence against her. When Dojo attempts to interfere, he gets shot in the arm and caught in the resulting fire as Kasahara looks on after detaining the head librarian.

Public criticism on the LDF due to the massive MBA casualties begins to grow against the LDF until Kasahara is ambushed by a reporter. Kasahara tells the reporter that the people should not be oppressed due to the MBA and their pro-censorship activities. Due to this, public criticism against the LDF dies down and instead, support grows thanks to pro-LDF media and Tezuka's older brother works in the background to eliminate anti-LDF bias. Dojo is diagnosed with agnosia due to his injuries in the Ibaraki shootout, but later recovers. Inamine decides to step down due to the discovery of radical elements in the MBA that were responsible for undermining the Mito Library Base. Genda has been promoted by the LDF's Administrative Faction as the Kant? LDF base's second commanding officer.