Amidst government censorship fueled by the Media Betterment Act, the Library Defense Force emerges as a stalwart protector of free expression. Within the Kanto branch, the elite Library Task Force, comprising exceptional warriors, safeguards intellectual freedom. Iku Kasahara, once saved by an LDF member from censorship's grasp, joins the force to emulate her savior. However, LDF training proves grueling, especially under the strict tutelage of Atsushi Doujou. Despite the challenges, Kasahara's selection as a new Library Task Force member shocks her. As she strives to prove her worth and understand Doujou's cryptic intentions, Kasahara battles not only on the front lines but also within herself.