Kasahara Iku had joined the Library Taskforce, following in the footsteps of her mysterious "prince", an officer of the said taskforce who had rescued her from the Media Betterment Act's (MBA) defence force. Back then, when she was just a teenager, Iku was at the bookshop buying a much-awaited last volume to the serialised novel that she loved, when the MBA defence force had swooped in and declared the book to be in violation of the censorship law, and thus were to be all seized and destroyed. Although she cannot remember the face of her prince, she can clearly remember the touch of his hand tousling her hair. Upon joining the Library Defence Force, Iku gave her best to everything in her daily training, and was singled out together with Tezuka Hikaru, to join the elite Taskforce where she is picked on constantly by her drill instructor, Dojo Atsushi. As the days go by, between her impudence towards Dojo, and the strict punishment meted out by him to her, Iku finds herself slowly falling for him. In the meantime, Tezuka finds himself strangely attracted to Iku's roommate, Shibasaki Asako, who works as a staff at the library counter. He feels very disturbed when he sees Asahina Shuji, a self-declared museum curator, calling on Shibasaki frequently. Elsewhere, Taskforce senior officer Komaki Mikihisa, bumps into his childhood friend, Nakazawa Marie at the library. Unbeknownst to him, Marie harbors a secret tendre for him, and tries to get near him by approaching him to recommend a book from the library. One day, the MBA arrests Komaki, for recommending the book to Marie, a book deemed immoral and censored by them. The Library taskforce are up in arms over this unnecessary and nonsensical excuse the MBA are using to get at them.