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.
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