In a world where literature is under siege, one young woman's quest for knowledge becomes a battle against censorship and oppression. Iku, a determined Library Defense Force recruit, must navigate a complex web of alliances and rivalries in the fight to protect the written word. As she delves deeper into the heart of this struggle, she finds herself drawn to Atsushi, her team leader, while also uncovering the motivations behind a high school student's arrest for recommending a book that sparked controversy.